CHAPTER WARNINGS: (these contain spoilers!) incest, nudity, fingering, fondling, dirty talk, nipple play, taste testing, cunnilingus, light spanking, sixty-nine, analingus.

NOTES: A lot going down this chapter! Pun intended! Thanks for sticking it out this long, and I promise there isn't much more to tell. This fic will definitely be completed by the end of the month.

TheChronicle: I didn't say you based all of your opinion of Anna on personal experience; just that it's shading your perceptions more than you realise. And I'm not sure how you don't see a difference between someone being well-meaning-but-pushy and someone being an intentionally manipulative sociopath, but there is one. A lot of what you've been doing in your reviews is making a supposition that may or may not have any basis in the source material, and then charging off down that rabbit hole at full speed, assuming your supposition to be fact. I get that it's fun to pick apart a fic like that, but by the time you reach the end of the rabbit hole you created, you can't even see the point of origin anymore. Also, your firm blanket statement "incest is not a good real-life thing" makes me wonder why you're reading Elsanna in the first place. I disagree, because you cannot pass judgment on all incestuous situations between all consenting adults (and doing so makes you kind of a jerk?), but I don't really think it's necessary to get into a debate about that, and am not going to initiate one. But thank you for showing me that "Anything Her Heart Desires" is not a fic I'm going to be reading anytime soon. Yikes.

LordDarthYoda: About all I can say is, a lot of people talk during sex. And it's really important to talk about sex, even when you're not having it. Hope that relates to your review, because I'm about as confused as you were saying it, haha.

Spooths: Stolen Ice top kek (except I never finished it)

Mpsantiago: Wish granted; it's already two chapters longer than the rough draft, and it's going to be another chapter longer before I finish it. Yayyyy!

~ CHAPTER THIRTEEN ~

The room was already dark. Almost as if to give herself an excuse to linger, Elsa turned off the other lights in the apartment, set up her briefcase for the following morning. Turned off the TV. Little things to delay her return to the bedroom.

"Can I turn the light on? I need to get pyjamas."

"Do you?" The question was so simple that Elsa had to think about it for a moment before she deciphered it, and then she giggled. Another giggle came from the shadowy form in the bedsheets. "I skipped that step so I won't judge if you do, too."

"You make me feel so reckless," Elsa breathed as she approached the bed, moving slow, hesitant. She rarely slept naked, even by herself. Should she or shouldn't she? She knew full well what it would lead to if she braved nudity at this juncture.

Summoning her courage, comforted by the lack of light and Anna's easy manner, she let the towel drop to the floor and quickly slid under the covers.

"There," Anna said, reaching over to find her arm, hand trailing down to find Elsa's hand. "It's dark, we're covered. Nothing is exposed."

"Very true." But she felt even more exposed than she had with Belle and Cindy in her office. "And it's not like this is the first time we've done this."

"What?" After a second, she laughed, long and loud. "That summer when I kept taking off my diaper in my crib, and you got jealous!"

"Mom never let us live it down," Elsa chuckled, bemused but melancholy. "She used to always force us to endure the picture being showed around…"

"Well, what do you expect? You were even crying just like me, and you were way too old for that!" As they both cackled, they rolled to clutch each other's shoulders, enjoying the moment. Then Anna sighed. "God, I forgot all about that stupid picture… you didn't keep it, did you?"

"Yeah. It's… not here, it's buried somewhere in storage. Safe from blackmailers." They shared another laugh. "Ohh… wow."

After a few more moments, when their laughter had already died down, Anna whispered, "What are you thinking about?"

"Nothing. Thinking that… that we grew up together. We both came from the same womb, Anna. I'm willing to admit this feels right, but it is wrong."

"No, it's wrong by societal standards. And I will keep saying it," she cut off her sister's protestation. "I never want you to question my feelings on the matter. As far as I care, you're only more ideal for me because we have a history together, not less. Você entende?"

"Ideal? Anna… this…" Her hand caressed Anna's hip, and she felt both thrilled and terrified about it. "All this can ever be is… curiosity. We could never be anything more to each other, it's… nobody would understand. I don't even understand it, so how could they?"

"I know." One shoulder shrugged. "Not that I care about them myself, but I do care about you and how you feel about what they think. I respect your sphere of consciousness, and that it includes the opinions of others."

Elsa rolled her eyes. "I'm well aware of how you feel about my spheres." But then when Anna grasped her backside, she gasped. "H-hey!"

"Thought you said you knew how I feel about them," Anna giggled, kneading in with her fingers. This time, she tugged a little more at the ample flesh, pulling up and away. "Mmm…"

"A-Anna… what are you doing?"

She grinned; Elsa could just see her teeth glinting in the moonlight. "What was it somebody just said about curiosity?" A whimper escaped her, and Anna continued to cause more, shifting the flesh around as she squeezed her other hand, to let her know that she hadn't forgotten their bond.

Elsa had let that go on for far longer than she intended when she panted, "I n-need to ask you something."

"Yes?" Anna said as she kissed her neck.

"Nhh… h-have you… had these feelings for me for longer than just… this week?" She seemed so stunned by the question that she felt compelled to add, "Maybe it's… not fair for me to ask you. I'm sorry."

A second passed, and Anna drew still. Clearly, she was thinking. "You know… I'm not sure. Maybe? Like, I remember feeling a lot of affection for you the last time I visited, but… there wasn't anything sexual that I was aware of, I guess. I dunno."

"That's fine. I mean, I might have felt things for you without realising it, too. It's entirely possible. But I want you to know that I never, ever was aware of them before the past few days, alright?"

"Okay," Anna giggled easily. "We probably both were curious about this before now, since, well… it's coming so easily. Do you feel that? Like, how we kind of fell right into each other's arms, even though last time we barely even hugged."

"Exactly — and this time, you said you actually wanted to 'fuck my ass', if I remember correctly." Anna only nodded with a little smirk, and she laughed. "I appreciate you always trying to make me feel better, but… you wouldn't really. Would you?"

"Absolutely. It's super hot."

"Wha-" Gulping, she tensed her cheek under Anna's hand, which was now just lying there lazily. "B-but… well, I mean, thinking it's attractive is… not the same as wanting to do something like that."

"That's true," Anna conceded, kissing the tip of Elsa's nose as she began to knead the firm, round dome again. "But in my case, I feel both things. Just wish I had a dick to do something about it."

Instantly, Elsa's desire was all the way back to full blast. She'd been able to keep it down to a simmer before this, but how could she with Anna being so forward? Never before in her life, even when Anna said that in the diner, had she entertained the thought of something sliding into that part of her anatomy. How on earth would that feel?! Her panting escalated as Anna played with her, eliciting more sighs and quiet moans. Maybe it wouldn't feel so awful, terrifying as the prospect was.

"We should probably set ground rules," Anna whispered. "Where's off limits? What don't you want me touching? I'm kind of happy just to be touching you, so don't worry about disappointing me."

The words "no limits" were on her lips, ready to emerge, but she bit them back. She knew if she said that, then it would be frustrating for Anna if she had to take them back later. Better to heed her suggestion and set the limits beforehand. But if not that, then what limits were wise? What ones would allow them to enjoy each other fully, and not result in Elsa hating herself in the morning?

"Lights stay off," she finally managed to whisper. Anna kissed her lips, and she moaned but persisted. "Uuhmm… I would appreciate it if you don't call me 'sis' or 'sister' while we're doing this."

"Totally understood," Anna sighed with a small nod. "Keep it separated."

"God, this feels like such a mistake already! But…" Gulping, she had to force the next words out. "N-nothing… inside. Especially not anal, because I'm not quite ready for that. And, w-well… I keep wanting to say that we should keep our hands to ourselves, too, but it's not very realistic. Because I think we both… want to… touch."

Her own hand found its way to Anna's trim backside. She sucked in a breath, then hummed contentedly as her legs curled up, knees brushing Elsa's. "Mmm, yeah. I'm glad you're not taking touching off the table."

They scooted closer together, continuing their kiss. Elsa could feel erect nipples against her own, a bit above, and legs sliding over her legs. Eventually, their hands unclasped so they could play with each other more, grasping at stomachs, chests, inner thighs. Exploring. Elsa wished the alcohol hadn't left her system so long ago; she could use its bolstering effects now.

Especially when fingertips began to glide up and down her wetness. Her body jerked away from it, and Anna raised the hand up to her hip again, leaving it there. They kissed for another minute before Elsa herself returned Anna's hand where it had been.

"You're sure?" Elsa only nodded, and she kissed her fleetingly. "You're so wet already."

As the fingers pressed in, Elsa panted, "Y-you make me wet…" When Anna sucked in a breath of surprise, she turned away, tears stinging the corners of her eyes. "Sorry. That sounded terrible, y-you shouldn't have to hear that from me."

"You make me wet, too," she promised her. After a second, she began to stroke faster, earning a gasp of pure pleasure. "Mhhh… you feel good, sound good! How are you this hot and still available?"

"I'm n-not hot!" Elsa burst out, too used to responding that way to stop herself.

"The hell you aren't! I'm on fire!" Her lips found Elsa's again, and they kissed for a moment before she pulled back to whisper, "Y-you won't believe me… but… I don't think I've ever wanted it this bad before!"

"What?" she panted. "W-wanted what before?"

The hand finally left its place on her ass to reach up into her golden locks, drawing her close while the other hand only sped up. In a husky voice, she whispered, "To fuck."

A long, unhinged moan fell from Elsa's lips as she rode the punishing fingers up against her. As per her wishes, they did not enter, but only slid up to her clit and began to circle frequently, fanning the flames burning there. Elsa was already close — a second orgasm beside her sister, and both came on faster than expected! She wanted to tell Anna to slow down, to let her enjoy it or to reciprocate to some degree, but it was too late. Within a few more strokes, she was already writhing and spasming, riding out the waves as her own sister brought her to climax.

"Shhh, there there," Anna consoled her once she had collapsed, sobbing onto her shoulder. "I know, sometimes it can be an ethereal experience, and an emotional one. Don't hold back, don't suppress."

So she didn't. However, the crying only lasted a minute or so — and she was well aware that a lot of it had to do with other matters; self-image problems, Belle making work feel unsafe. Then she sniffled and shared a tear-soaked kiss with Anna, who endured it like a trooper.

"I love you so much," she blubbered again and again.

"I love you, too," Anna assured her, embracing her tightly. "Ohhh, it's okay, Elsa. It's okay."

Little by little, her emotions settled, and she began to feel more content. It was only after a minute that she realised it was from breathing in Anna's scent, as close as she was to the source. She felt safe, loved, at home. And she snuggled in as she began to pet up and down Anna's inner thigh.

"You don't have to get me back," Anna tried to assure her. "Like, that clearly took a lot out of you just now."

"I really want to. You… it feels like it's always about you doing things for me. Well, it's your turn." She was getting closer, but still not quite there. "But I've never touched another vagina before."

"It'll feel a lot like yours, I assume," Anna told her, and they shared a bemused grin. "Sorry, I didn't mean for that to be about… you know. Maybe those jokes aren't gonna be funny for a while."

"Not very funny, but a little funny." However, the "joke" did give her fresh pause. "You're sure you're okay with this? I'm your… well, what I am. And I know we're both mature adults, but I'm still older. More responsible."

"That might have mattered five years ago," Anna snorted as she opened her legs completely, rolling onto her back a bit so they would lie open. "But not anymore. Go for it."

Elsa didn't hold back any longer. When she first touched Anna, braced for it to feel disgusting or wrong, all she found was that it was furry and wet and vagina-like. About what she expected, and very little of what she feared. But nothing prepared her for the deep intensity of Anna's moan.

"Ooohhh, YES! Mm, Elsa, wow! Y-you're really touching me!" The hand shot away, and Anna blinked up at her. "Wh-why'd you stop? Are you okay?"

Shame was flooding through her, fresh and raw. Was she a monster for doing this to her sister? No. She knew it in her mind, that rationally, if she and Anna both wanted to try this, there was no problem. Slowly, the logic overcame the panic, and she shook her head.

"Sorry. Just… just a twitch." Then she touched her again, rubbing in small circles. "Good?"

Anna nodded, lying back again. But this time, she reached over her chest to caress the side of Elsa's face. "Thank you… I… don't think you realise… that I was dying for this!"

"Sounds like it," Elsa whispered as she continued the motions. Little by little, she sped up her hand, listening as Anna's expressions of pleasure rose in pitch, in frequency. All the while, the gentle scent of musk filled her, made the experience as pleasant for her as it was for the one receiving.

And she wanted more. The desire was dark but she felt it all the same. This was already a poor decision, but she wanted to push further, to experience more! So she nuzzled downward, eventually finding one of the small, pert peaks and leaving kisses upon it, flashing her tongue across its erect tip.

"OH!" Anna burst out in surprise. "Elsa, y- wow!" When the lips wrapped around it, she let out more outcries and profanity, hips bucking up into Elsa's fingers. The shame was getting less and less prominent, and all Elsa could focus on was how much Anna liked what she could do for her.

Within no time flat, Anna was also finishing. Seemed things would always go that way; Elsa first, then her younger sister behind her. As in everything else. Not that it wasn't even more glorious the second time, when she could be directly responsible. It definitely was.

"You… I… damn! How?!"

"So eloquent," Elsa chuckled as she kissed the center of Anna's chest. "Did… you really like that? You weren't exaggerating?"

Leaning down, Anna whispered into her ear, "I'm pretty sure I could go again." Elsa shivered, and she drew back with a chuckle. "The first one was so intense and quick that just thinking about it makes me want an encore!"

Swallowing hard, Elsa breathed, "What a coincidence" as she drew her hand up and out from under the covers. Even in the low light, she could see it glisten with wetness. She marvelled at the sight. A woman's essence. Her sister's. Against all odds, both thoughts were equally strange, and yet not strange at all to her in that moment. The scent was even pleasant, much like the one she had sampled before.

"Yep, that's me." Anna's little comment made them both giggle, and took away some of her wariness. "What is it?"

"Do you think it's… strange that I want to try it?"

At that, Anna leaned down to kiss her head again. "Not at all. Go for it, if you want." But the moment Elsa did, she sighed, "Ooh…"

It tasted odd. Good, very mild, but nothing mindblowing. However, the scent rolling off her hand was incredible! She kept doing it for the mere reason that she could tie the scent to the taste, and enjoy the both all the more for sharing with each other. In a matter of minutes, the hand was clean.

And she inwardly cringed when she heard herself saying, "All gone" in a whiny, juvenile voice. However, Anna didn't seem to mind — because she responded in kind.

"Awww, I'm sorry. But there's more where that came from, you know."

She was right; there was more. Elsa only hesitated a moment before she began to turn, hand pushing the covers down as she went. Little by little, her face grazed downward, until she was hovering over a thatch of furry redness that could scarcely be made out in the dark.

"W-well," Anna whispered from a little further away now, voice nervous. "I, um… okay then."

"What? What is it?"

"I kinda meant you could put your hand down there again," she half-laughed. "But this is good, too. You, um… you really want to do this? I won't be disappointed if you don't."

"Honestly? I… have no idea." Her heart was pounding a thousand miles a minute, but she forced herself to ignore it and instead kiss the gently-curling hairs, inhaling the vague scent from there. "S-so if all I end up doing is… looking around…"

"It's fine by me," Anna finished for her, regardless of what she had been about to say. "It just means you get to come back up here and kiss me again."

Trim thighs parted for her, and Elsa inhaled deeply. It was too good; her mouth was already watering. What a strange reaction that was! In the near-darkness, she couldn't see much but vague shapes, but she could feel. So she did; she felt first with her fingertip, watching the nearby thigh muscles twitch from her gentle probing. Then, when she couldn't resist any longer…

A long, low growl fell from Anna's mouth when Elsa pressed her lips against her wetness. Elsa herself let out a sigh; it wasn't nearly as awful as she had expected. Even after sampling the wares from her fingers, she had still been unconsciously thinking of doing something like this to be "disgusting", no matter what set of anatomy the person had. But it was merely sweet and wet, and the skin soft, pliant. And with that scent surrounding her, filling her with desire and comfort and everything between, she found herself only wanting to continue. To delve deeper with every passing movement of her lips, then her tongue, then drawing fragile labia into her mouth.

"Elsa!" Anna's voice burst out somewhere far away. "Y-you're really- NNhhh, it's so good! My pussy's in your mouth! You like me? You w-want me this much?"

The words were so obscene they threatened to bring the shame back to her actions, but Elsa found they didn't; she was simply pleased to know that Anna loved it. That she didn't hate the both of them for letting this happen, or want to stop. She found it easy to roll to one side, to kneel up so she could push her head in more fully, lap at the newfound territory with eagerness.

A hand gripped her backside as she continued, and she paused to look downward in alarm. "A-Anna, don't distract me!"

"S-sorry! I just… I love it being right here…" The hand continued to pet up and down the thigh below, and Elsa flushed even more than she was already. "Beautiful."

"It is not." The hand drew away and came back down swiftly, swatting her across both cheeks. "AH! O-ow, what was that?!"

"Don't tell me it's not beautiful when I think it is," Anna pouted. But seeing Elsa's wide eyes, she ducked her head. "Sorry, I didn't think it was all that hard."

"It wasn't," Elsa breathed. "But still… I don't know how I feel about you spanking me!"

"Don't feel any certain way; it was just a joke-spank, not a real, like…" As she tried to explain, she fell silent with a little shrug. "You know what I mean."

Nodding, Elsa turned back to the task at hand. Wanting to make a splash, and somewhat get revenge, she started out by using a thumb to push back the hood and wrap her lips around Anna's clit.

"NNHHH! Yes, Elsa, YES!"

And off she went. Though Anna was definitely enjoying herself, widening her legs and rolling her hips up into the contact, she also never stopped petting Elsa's cheek and thigh, occasionally grabbing on. Though Elsa had privately sworn to herself that she was done for the night, only wanting to explore Anna now, she found that resolve weakening. Her touch was so teasing, so wonderful…

It only took the silent encouraging of Anna's hands for Elsa to raise one leg, letting her sister move it to the other side of her head. She redoubled the movements of her mouth and tongue to distract herself from the idea of Anna being surrounded by her fat thighs, to see all that rounded, dimpled flesh above her face. It was what Anna wanted, for whatever reason she did; why feel ashamed of it? The shame would surely come later, either way.

It wasn't until she heard the soft humming, then felt the lips against her inner thigh, that she spoke. "W-wait, Anna! I… you can't do that while I'm… doing it!"

"Why not? Sixty-nine!" This was said with a light giggle, as if it were the most obvious thing in the world.

"Because, I… I can't… handle… both giving and receiving at the same time," she confessed.

"Oh. That's okay; I can wait, then." She left another kiss there, then sat back. "Finish me off, my Elsa."

My Elsa. Her heart leapt in her chest, and she found herself immediately throwing herself back into devouring Anna, if only to better ignore what implications that might have held.

It didn't take long. Even though it was Anna's second of the night overall, it seemed that the idea of this happening between the two of them made every climax surge right up and bowl them over with very little warning. Elsa's heart soared, and she knew she would never forget the feeling of throbbing flesh under her mouth, of her sister's keening of pure delight. Maybe that was not a good thing, but she had a lot of trouble caring just then.

She'd barely stopped and begun to leave lighter kisses when she felt Anna doing the same. The moaning and sighing she did into Anna made Anna shiver. After a few seconds, she asked, "Y-you're sure this doesn't bother you? Just because I did it…"

"I want to," Anna told her simply, cutting through the worries. "Can… can I? I g-guess I technically never asked, but… you're not stopping me… but if you-"

"Yes," Elsa told her. "Don't know why you would want to, but far be it from me to say 'no'."

"Do you want me to tell you?" She could just look down and see Elsa nodding between her hanging breasts, so she left a quick kiss on her inner thigh. "Because… I've wanted to ever since I saw this last night. Like a painting, remember? There's… so many things I wanna do!"

"You really don't find me hideous? I'm so- ooh…" The tongue running up her inner thigh had cut her words off.

"Not even a little. I keep trying to tell you: this is the best booty. My favourite body of all time." Her hands gripped a cheek, as if to emphasise her point. "No matter what happens, I'll have no regrets because I got this close to the best ass in the universe. So that's a permanent plus."

As lips grazed over her wet folds, Elsa swallowed and pushed her face into Anna's thigh, head swimming with pleasure. "Mmhhh! You… really know… how to flatter… ohhhh, Anna…"

She did pleasure Elsa for quite some time, showing an incredible expertise that all but proved she had been with a woman before. Then, when Elsa least expected it, she drew back and said, "You really think it's just flattery, don't you?"

"H-huh?" Having to take a moment to shake loose the cobwebs of arousal, she finally remembered what they had been talking about. "Oh… w-well, yes. Though it's very sweet of you."

"Why can't I just be into big booties? I like your body, Elsa. Even if you weren't my s… my Elsa, I'd think you were very attractive. I just wish I could prove it to you."

Elsa sighed, both in lingering pleasure and vague impatience. "Well, you were doing a decent job of it a minute ago… but no, I don't think there's a way you can really prove my 'big booty' isn't awful, and I defy you to figure out a way."

"Hmm, really? Bear with me; this will just take a second." Then Anna leaned up, and-

"OH, ANNA! Wh-what are- STOP THAT!"

Drawing back, Anna whispered, "It was just a kiss! I'm done, I promise! But I wanted you to know-"

"That was my-" She didn't want to say it. "I told you, I didn't want anything in there, any- you were going to put your tongue inside!"

"No, I never used my tongue!" Anna told her urgently, petting up and down her thighs. "Just my lips; they felt wet from the rest of you, that's all! But… I thought maybe a little kiss… I'm sorry, Elsa, but I wanted to accept your challenge!"

Inwardly, Elsa cursed herself. She had told Anna to figure out a way, even if she had presumed it was an impossible feat. Still, how could she actually stand to put her mouth up against someone's anus?! No matter who they were! It felt…

It felt too intense. She couldn't say "bad", because the only bad part had been the initial shock of it all. Nor was it "good"; just odd and unwelcome. Given time, she could probably get used to that the same way she got used to all the other bizarre things they were testing on each other.

"I'm sorry," Anna repeated, kissing her thigh desperately. "I should have given you more warning! But I didn't think-"

"It's alright," Elsa cut her off with a shaky sigh. "I… can't believe you did that, wow… wasn't it disgusting? Doesn't it smell horrible?!"

"Not right now. I mean, you did just shower, right?" Anna petted her cheeks again. "But I'll never touch it again, promise. I mean, unless you challenge me to prove I like your butt again. Then I might."

"A mistake I won't make twice." After another moment or two, she cleared her throat and asked, "You… really don't mind that? You like me, um… back there?"

"Yeah. It's… I mean, I wasn't so much thinking about the hole before, just the shape of it. But it's all great, it… it really is."

For some reason, the nervousness in Anna's tone and the way they were discussing a specific kink brought back the things Belle had said. First, the feeling of shame from facing down two women, but afterward, something Belle had told her on her way out. That she might be able to… what was it? "Dom" someone. Not that she truly had any desire to do that, least of all to vindicate Belle when she didn't deserve any vindication. But it did remind her of something she'd heard people do.

And Anna was a very receptive partner. One who was open in the area of communication. If she didn't like something, she would say so, and that would be that. Maybe this would be a way of taking charge of the situation, whereas before she had felt helpless as a kitten with Anna's mouth up against her. What did she have to lose?

"Yes, I'll just bet you do," Elsa said in a tone that was supposed to be sultry. To her own ears, it came out sounding like she ate bad clams and was having cramps, but she tried to improve it as she went. "You like my filthy ass, don't you?"

For a second, she felt Anna go still beneath her, and she worried she had screwed up. But then Anna let out a long, low purring sound of bemusement. However, all she said was, "Oh, yeah! I love it, Elsa! So much!"

Good: they were both in on the game. "That's right! You worship it! You… bad, bad girl!" This time, she cringed inwardly so much that it happened outwardly, as well. Anna giggled, but kept it short and quiet. "Work with me, here!"

"I am!" Clearing her throat, Anna nuzzled a spot between Elsa's dripping sex and one of the large cheeks. "Ohhh, yes, Elsa, I'm so lucky to be this close to it! I worship your beautiful ass!"

"I know!" Licking her lips, she pushed herself down against Anna's face, trying not to lower too much and smother her. "You said you wanted to fuck it! Do you? Want to fuck my ass, you… you degenerate?"

Anna nodded, kissing along the cheek while her fingers began to work at Elsa's sex again, so that it didn't get neglected while they were acting out this bizarre improv bit. "So much! I've… been imagining it, I can't stop! I crave your booty!"

Strange as it was, this dirty talk was spurring her on, getting her closer. It shouldn't have been, but it was! Quite a lot, in fact! Not wanting to question success, she called out, "Tell me! Tell me everything you want to do!"

"I w-want… to open you up and drive my fingers deep inside your sexy ass! Or even a vibe! R-really show you how much I worship it, Elsa!"

"You WHAT?!" When she felt Anna falter, she hurried to cover her alarm. "I m-mean… yes, of course! A dirty girl like you would want to do that!" Privately, of course, she couldn't believe Anna would. There was no way something as big as her vibrator was going in that location!

Still, it was a bit of a turn on to hear Anna fantasizing about it. The area in question tingled, and began to tingle more when Anna said, "I'm so dirty! I want your ass in my face all the time, I love it! If I had a dick, I… I would wanna fuck it every night!"

From nowhere, an image of herself laying back with Anna above her, holding her legs off to either side as she slid an enormous cock into her ass appeared in her mind. Once there, all Elsa could do was turn it over and over, try to push it away only for it to come back stronger than before. What on earth was she turning into?!

As her heat built again, she began to brush her fingers over Anna's wetness, prompting quiet squeaks and groans from her. Of course Anna shouldn't be expected to finish a third time, but she wanted to give her back some small fraction of the pleasure she was currently enjoying. All the while, fingers and a tongue were driving her directly toward her own second "O".

She wanted to say it. She couldn't! But in the end, her seemingly-unstoppable curiosity won out. Licking her lips and trying not to let her self-hatred take hold, she said, "D-dirty Anna… you disgust me. I w-want…"

After a moment, Anna prompted her, "What do you want?"

"I want you to prove your devotion to my ass," she managed to say in a rush, before biting her bottom lip hard. She really said it. She said she wanted Anna to repeat the unspeakable act from before.

"Y-yes, ma'am!" she breathed. A moment later, lips pushed up against her forbidden entrance.

And it felt wonderful. Not as pleasurable as against her sex, but a different, adjacent feeling, one that sent tingles down into the soles of her feet, up into her sensitive peaks. A fluttering stirred in her stomach. Why were the nerves so sensitive there, in such an unwelcome place? She could feel her muscles twitching away from it instinctively, but the gentle kisses were winning her over. She still felt bad for Anna having to do it, but maybe the actual sensation of having it done to her wasn't so bad.

When Anna began to stroke along her folds again, everything changed. Both sensations were incredible when paired together! The orgasm that had been slowly building began to rise at a quicker rate, and she opened her thighs more, ready for anything now.

Anything except a tongue. It was gentle, and did not pry, but it slid over the tightly-closed entrance and caused her to squeak in ill-suppressed alarm. How could Anna show even this most disgusting part of her so much love? It brought tears to her eyes, even as she felt her finish getting closer.

All of her reservations fell away. "G-go on!" she finally called out. "D-do what you wanted! Fuck my ass!"

What she got for her troubles was a muffled response, but Anna made good; her tongue pressed harder against the opening, drew back and pressed in again. Each miniature thrust of the wet muscle prompted an outcry of pleasure from Elsa, because combined with the hand doing its furious work, she knew it wouldn't be long.

"Anna! Anna, YES! I love this! I love it s-so much, I- RIGHT there! Yes, more, yes, y- MMHHAAAAAHHH!"

Which was how Elsa came to the strangest moment of her entire thirty-odd years of life: orgasming with the very tip of her sister's tongue pushed inside her sphincter. And against everything she would have believed, it was also the best moment of her life.

~ To Be Continued ~