"Marcoooo!"

Star saunters into Marcos room and plops on his bed. Marco takes his eyes off his computer and looks over at her.

"Whats up Star?"

"Well, I have many questions that hopefully you can answer."

Marco gets up and sits next to her on his bed.

"I can try. What's your question?"

"What's "eating a girl out" mean?"

"...wh-wh-what do you mean?"

Star kicks her feet and sighs.

"Well, earlier at school.

-Earlier at school-

Star walks up to Jackie and her friends, listening in on their conversation.

"Like, a boy never offers to eat you out! They expect us to suck their dicks, but licking our pussies is just too much!"

Jackie looks at Jenna in confusion.

"Jenna, I asked you if you wanted a stick of gum."

Star blinks in confusion and walks away. Her thoughts were stuck on what Jenna had said.

"Maybe Marco can tell me. He has to know what they were talking about."

-Back in Marcos room-

"Star, do you guys have sexual education in Mewni?"

"Marco, you saw what Mewberty does to me. The boys are taught to run and hide so we don't lay our eggs in there spines."

"...true. I should have thought of that. Well, I guess it's time for the inevitable. It's time to teach you about sex."

"Yeah! Are you gonna turn into Marco, PHD?"

"No Star, now I'm-"

Marco puts on a lab coat, his glasses, and grabs a medical textbook.

"-Marco Diaz, MD!"

Star claps and jumps on the bed. Marco smiles and grabs a white board and expo-marker.

"Now, let us start at the basic concept of sex. So-"

-3 hours later-

"-and remember, even if a priest says masturbation is a sin, he most likely does it too. Now then, on to things similar too, but not exactly like sex."

"Like eating a girl out?"

Marco nods as he draws a simplified version of a vagina and a tongue. He presents it to Star.

"So, when a boy and girl want to get, as some say, hot and bothered, they preform certain acts with their mouths on their partners genitals."

Star nods, showing obvious interest in the topic.

"When a boy wants to pleasure a girl, he can use his mouth and tongue to simulate the girls vagina, or love cave as you call it."

"And boys don't mind?"

"Some do, some don't. It's all about preference."

"...would you mind doing it?"

Marco doesn't even hesitate.

"If someone wanted me to."

Star squirms on Marcos bed, thinking of a way to ask the one question she wanted an answer to.

"Can you-can you do it to me?"

"Wha-"

"I want to know what it's like! And...I feel comfortable with you. All that sex stuff you talked about, I want you to do it with me."

"Star, only people who are dating do that stuff, and you and Oskar just started going out, ask him to-"

"NO!"

Marco gasps at her sudden interruption. Star looks at him in anger.

"I want YOU to do that stuff with me Marco! I want to make sure my first time is with someone I know well, with my bestie! I like Oskar, but I'm not ready to do that stuff with him."

"Star."

"Please Marco, I've heard Jenna call Ferguson her fuck buddy and they aren't dating! Why can't WE be fuck buddies? Or, even better-"

Star uses her wand to make 2 words appear in the air.

"Fuck besties!"

The words proceed to light on fire. Marco screams, grabbing his fire extinguisher and putting the fire out.

"Well?"

"It's obvious if I don't say yes, you'll hate me forever. So, yes. I'll be your fuck bestie."

Star squeaks in excitement and jumps onto Marco, hugging the breath out of him. She smiles at him and he smiles back. Then Star kisses him. A small kiss, an innocent one.

Her first kiss, and his as well.

"Now, lets get to business."

Star pants as Marco kisses her neck and his hand touches her pussy through her underwear.

"Marco~"

"Star~"

Marco removes his hand and lowers himself to her panties. He slowly pulls them off and throws them aside. For the first time in his life, Marco sees a girls pussy.

"Wow."

Star blushes and hits his head.

"Get on with it!"

Marco obliges, sniffing her at first, enjoying her oddly sweet scent, then giving her one long lick along her slit. Star moans at the sudden contact, her thighs going around his head and pushing his face closer to her pussy. Marco sees this as encouragement, giving the outside of her pussy a few more licks before forcing his tongue inside.

"OH GOD!"

Stars hands grasps Marcos hair and she started grinding her hips on his face. Marco explores the inside of her love cave with his tongue, and he feels her love juices flow out along his mouth and chin. He heard Stars whimpers and cries for more, knowing what he was doing is working.

"Marco. I can't take it."

Marco stops and decides to bring her to climax, knowing just the thing to do it with.

He gives her slit a few more long licks before using his fingers and searching for her clitoris.

"Marco? What are you-"

And he finds it.

Star nearly screams when he rubs the small, pink marble. Then he does something risky.

He wraps his mouth around the area and rolls his tongue on her clit. Marco knows he succeeds when her thighs trap his head and her hands pull at his hair. He winces in pain as she screams his name. When she calms down, Marco removes his mouth and tongue from her pussy and wipes his face with a napkin.

Star flops on the bed, sweaty and crying. She reaches her arms out for Marco, and he pulls her up into a hug.

"Marco?"

"Yeah Star."

"I lost myself when you licked my love button. Everything went white."

"And?"

"I LOVED it. Thank you."

She kisses him roughly and pulls him onto the bed.

"'m tired."

"Wanna take a nap?"

Star nods.

Marco pulls the blanket on them and pulls Star closer.

"When we wake up, I'm returning the favor."

Marco blinks and blushes.

"And I'm gonna make you scream."

A few moments later, Marco hears Stars soft snores. He decides to not worry and follow her lead and sleep.