Hello everyone! This is my first smut-Fic, after years and years of reading them! I hope you enjoy! Note: I do not own RWBY, and do not claim any of the properties related to it.

Chapter One

When Ruby woke up one cold Saturday morning, the last thing she expected to be was alone. Weiss always made sure to wake her up at 8:30 on Saturdays so she could eat breakfast with the rest of the team. But today, it would seem she let her youngest teammate sleep in. Groggily, Ruby turned over to the small side table below her, where the alarm clock read 9:30.

Next to the clock was a small plate, with three still steaming cookies on it, a mug of warm tea, and a note. Ruby jumped off her bed, her feet landing on the cold ground. Her budding breasts hardened in the cold, pointing out like ice cream cones against her body. She looked up and grabbed her blanket, wrapping it around herself as she grabbed a cookie. As she took a seat on Weiss's bed, Ruby's available hand grasped the note left for her. On it, in the crude hand-writing she was oh so used to, read:

Dear Ruby,

Blake and I have to head to downtown Vale to restock our dust supply, so you and Weiss will have the day to yourselves. Good luck, you'll need it.

Sincerely,

Yang

Ruby scratched her head, for surely if Weiss wasn't going with them, she would have woken Ruby up for sure! But then Ruby noticed on the ground lay a second letter, written a much fancier font. On it was the note:

Dear Ruby,

Yang and Blake left about half an hour ago. I have a fencing lesson today at 7, so I decided to let you sleep in. Enjoy your day, and don't you dare touch any of my stuff.

Sincerely,

Weiss Schnee, heir to the Schnee Dust Company

Ruby's heart skipped a beat. "Could it be?", she pondered out loud, "Could I really be on my own for the day?!" She couldn't hide her excitement and let out a little squeal. Finally she could indulge in her deep dark secret. From underneath Weiss's bed, Ruby grabbed one of the loose floorboards, where a large box lay. It had been so long since she was able to access her box, let alone use it! Ruby pulled the box out from underneath the bed, bringing the dusty container into the sunlight. She blew the dust off of the lid, filling the room's air with allergenic dust, causing Ruby to sneeze. With her sneeze, Ruby felt a single drop of pee eject from her slick folds, landing firmly in her panties.

"Not yet!" She said, scolding herself and giggling. She then took the lid and removed it, revealing her deepest hidden secret: Diapers. Lots and lots of diapers. Every since Ruby could remember, she had a fascination with diapers. Maybe it was because she wet her bed until she was 9, or maybe it was because she loved to be babied by her father, who always seemed to treat her more like a child than he ever did for Yang. She could feel her slit dripping, but not with pee, as she rubbed herself a single time, releasing a moan as she tried to hold herself back.

She grabbed one of her diapers and her bottle of baby powder, her grin not even dissipating a little as she did. She then removed her panties, revealing her well-shaven pussy. She then took the baby powder in her hand, puffing out some powder onto the opposite hand, and applying it to her wet sex. With her pussy powdered, Ruby took her diaper and began to put it on herself, the soft plastic crinkling with each minute movement she made. As the diaper touched her slit, Ruby felt herself spill, her juices releasing into the diaper, leaving an almost invisible stain upon it. Ruby let out another squeal as she pulled the diaper up on her rear, the soft material pulling her butt into a tight position. Next, Ruby grabbed the tapes on each side, pulling them towards her front, sealing her in the diaper.

Ruby's mind turned to mush, as her sexual pleasure reached a new maximum. After weeks and weeks of waiting, Ruby was able to return to her infantile fantasy once more, and her body was in pleasure overdrive!

Ruby began to moan as an orgasm passed over her body, engulfing her mind in a tidal wave of dopamine. She had to quiet herself before Team JNPR heard her and came in, so Ruby grabbed her little red pacifier from inside the box and plopped it in her mouth. With her voice now quieted, Ruby screamed into the plastic, her pussy burning with desire!

When her orgasm calmed, Ruby was left sitting on the floor with a slightly damp diaper. Popping her pacifier out, Ruby looked down at her diaper,

"Well this just won't do!" She huffed, "It would be a complete waste to just throw you out now! No, I need to get as much use out of you as I can!" With a cute little grin, Ruby spread her legs, and let her entire body relax. She sighed as she felt her lips slowly separate, with a small stream of pee beginning to flow out of her into the absorbing material of her diaper. This is the life, she thought, just being able to sit here, wet my diaper, and no one can stop me! She laughed as she went, her freedom granting her power over the world around her. She could feel her stream become stronger as she continued, her body expelling itself into her garment. The warmth of her pee spread through the diaper, the bright yellow staining the diaper until the entire diaper was the color of Yang's flowing hair.

As Ruby's stream started to dissipate, she began to shake her ass back and forth, rubbing the warm diaper against her skin. As if on command, Ruby began to cum again, but unlike last time, her pacifier was out of reach, and her legs failed to follow her commands. Her mind racing, Ruby gave up on her holding back, and let out a loud moan as she came, her body buckling under the weight of her arousal. She rode her wave for a good minute or two, her body thrusting forward and back against the soaking diaper as she squirted hard, her diaper being forced to absorb even more liquid! In the throws of passion, Ruby collapsed to the floor, laying her ass even further onto her soaking wet diaper.

When Ruby's mind calmed from her orgasm, she sat up, hoping no one was there. Fortunately, no one had caught her, and she could continue her day. Looking down at the damp diaper and slowly rubbing her sex with her hand, Ruby decided it would be much better if she didn't change just yet. Allowing her wet diaper to sit against skin, Ruby sat down on her desk chair, loading up her computer as she wiggled back and forth on her wet rear.

As the day went on, Ruby wet herself another time, and by noon her diaper was sopping wet, engulfing her bottom with warm piss. That was when Ruby felt a cramp in her stomach. The second she felt it, her face curled into a devious smile, as she knew exactly what was to come next. Before anything, Ruby ran to the bathroom, grabbing the air freshener, and deploying it around the room in preparation for her "accident".

Slowly, Ruby got into a squatting position, her diaper sagging down below her with her hot piss weighing it down. It only gets worse from here, my pretty, Ruby thought. Squinting her eyes and tensing her upper body, Ruby began to push. Down below, Ruby's puckered hole slowly contracted back and forth as she pushed, winking at the diaper as if to taunt it. On command, Ruby felt her mess start to escape from her behind, the warm mush entering her diaper. The diaper quickly began to sag again as she pushed farther, the large mess slowly filling the already soaked diaper to its very limits. She moaned and strained as she pushed, the mess finally reaching its maximum distance from her ass, pushing back and beginning to pad itself upon her butt cheeks. She smiled as it coated her ass, knowing she was gonna have to spend a lot of time cleaning her mess. Her hormones took over again as she started to rub her clit as she messed.

"Oh fuck, I'm having an accident!" She screamed, "I'm such a naughty little baby! I can't even hold my own mess! Oh, I need to be spanked and punished like a bad baby should!"

"Okay" came another voice. Ruby's eyes turned as large as dinner plates, her shaking body suddenly frozen in fear. Slowly, Ruby turned her head to the door, where she saw two pairs of black boots. She looked up slowly, fearing the inevitable, as she saw the faces of Yang and Blake. Blake's reaction was exactly what she expected: Eyes wide, ears poking as high up as possible, with her arms frozen at her side. Yang's reaction however, was not at all what Ruby expected. On Yang's face instead of fear or surprise, was a shit-eating grin, like she was happy she caught Ruby and she was reveling in the awkwardness of the situation.

...

And this, my readers, is where I will end this. Thank you everyone for reading! This will be continued, and I hope I did an okay job for my first smut-Fic! Please leave a review if you wish me to continue, because I know how obscure this fetish is, and I don't know if enough people will want to read it, so please let me know!