I finally watched the Adventure Time episode I missed, the one where Finn and Jake sneak into Marceline's home and get stuck in the closet…the part where Finn falls in the bathroom and a naked Marceline is floating right above him was hilarious. So that gave me an idea. An idea for a new prompt!

Summary: Marshall needs to quell that stalker-vampire instinct, and Fionna has an unexpected lesson on how well-endowed her undead friend is. Also, Cinnamon Bun.

The One With The Closet.

"Is he gone?" the chubby cat poked her little head out from the empty trench coat's neck, and the teenaged heroine peered from the clothing's lower regions, grunting at the weight of her friend as she stood on her shoulders. Any other day she would have shaken the animal off, but if she did it now, Marshall Lee would surely hear her, and they would be so busted.

"Yeah, Cake," Fionna whispered, struggling to keep her balance as her chunky companion began to tip her over, "so you mind hoppin' off for a minute before I bust my head open?"

"Sorry girl." She stretched her paws to the floor to silence the landing on the floorboards, and Fionna shook the dust off of her outfit, once again peering through the breaks on Marshall Lee's closet doors. The blonde silently followed the vampire as he swept the remains of his lamp into the dustpan and poured it into a trashcan; she gazed on, a ball of hope swelling in her chest when he opened the bathroom door and the sound of shower water pouring down the drain filled the room.

"I think this is our chance!"

"You sure?" Her feline companion stood close, attentive as Marshall could open the closet doors at any moment, "Go scope it out…"

Fionna turned a frustrated gaze towards Cake, and the cat simply nodded before using her fingers to sculpt a tiny Fionna-mimic walking; there wasn't much choice in the matter, and she simply groaned softly before carefully peeling open the door to the closet. She sent one last displeased look Cake's way, and ventured into the unknown of Marshall Lee's bedroom.

She looked around, preparing herself for a quick getaway if Marshall were to show unexpectedly, and found nothing out of the ordinary. His journal pages still lay on the desk where he left them after the sudden furniture wreck, and she stood above them, flipping through a few of their pages until her eyes skimmed over a few words she recognized.

'Journal,

'Today the Human girl I always go on about, Fionna, came over. It started out as a wicked jam session, but it kinda got weird and when she summoned my mom from the Nightosphere—of course, she got all pissed off I used the family axe for a Bass, I told her she wasn't even a part of my life anymore—and then she started sucking souls, her way out of every family problem. In the end it got mad emotional and finally she apologized for eating my fries, and we were cool, I guess. I mean, Fionna did have to suck her back to the fires of hell from once she came, but its whatever.'

"Fionna!" Cake none-too-softly whispered, snapping her little kitty fingers at the dawdling teenager who was making her wait, "let's wrap this up!"

She held up her pointer finger in a 'one more minute' gesture and continued from where she left off, so enwrapped with the life of Marshall Lee the Vampire King she didn't even hear the shower's head come to a stop.

'After that we just laid beneath the stars on some hill. I mean, don't label me as some sap, Journal, but I actually thought she was pretty damn beautiful.'

She.

"She." Fionna sounded out the three-letter word on her lips carefully; suddenly, the simple pronoun seemed to carry a certain chime to it every time it came out of her mouth, "She. She. She...me?"

Cake heard the door open before she saw it, and she hadn't even the chance to open her mouth and warn Fionna, when a wet figure, surrounded by mist from the hot water, floated out. The heroine jumped, every fiber in her being telling her to make a break for it, but she couldn't find herself to move one muscle; Marshall had seen her already, and there was no way she could ever get out the house undetected now. Clenching her fists tightly, she didn't hold herself back as she addressed the vampire.

"Marshall-"

And at that moment, she realized that he had undressed, and, at that moment, was still undressed.

He darted back into the bathroom, and Fionna grabbed Cake by the paw, darting out of the house.

Hours later, after the pair were snug in the house and content with a cup of chocolate, there was a knock on the door.

"Oh globs Cake!" Fionna shook, and the cup of cocoa clenched in her hands vibrated so tightly it spilled a large amount of incinerating drink on her leg, but she paid it no mind; the only thing that refused to slip from her mind were the wisps of steam parting from the bathroom, unveiling his pale body, confused expression, and his—

"What if it's him? If it is, tell him I never want to look at him again—he scarred me for life!"

The cat laughed, shaking her spotted head, "Girl, you ain't gonna die just cause you saw his…thingie. What you're feeling right now is the norm reaction for a first-time interaction with it."

"It wasn't an interaction, Cake!" Fionna moaned, rubbing her eyes with the palms of her hands, and her companion could feel her human stress from across the room; she took the cup out of her fingers, replacing it with a colder beverage, "It was super quick…but I can still see it right there. It was like in my face."

"You were six feet away."

"You get what I'm trying to say!" She curled up in a ball on the couch, and Cake sighed, patting her friend on the shoulder lovingly. She headed down the stairs, where someone waited patiently outside the tree-house, and opened the door.

"You've got a guest, Fionna!" the cat called from the bottom of the steps.

Oh, no. She leaned over the couch, trying to catch a glimpse of her guest so she wouldn't be too surprised, but to no avail; she knew who it was already, when she heard only Cake's footsteps as she climbed back up the steps. The adventuress could do not a thing except wait, and that she did, resting her head on the arm of the couch and closing her eyelids, senses high and on alert. She didn't move, however, when a presence loomed over her like a raincloud, and someone much heavier than her sister flopped down.

She waited, this time eyes open and looking in another direction, for him to speak.

"I guess you saw my wang, huh?"

"Saw it?" she muttered, pouting at the wall, "It was like staring me in the face."

"You were on the other side of the room."

"So?"

"And you shouldn't have been trespassing in the first place!" he cried, throwing his pale hands skywards in complete shock at her annoyance towards him, "I didn't put the damn note up there for decoration! It said, 'Fionna and Cake, do not go in my house until I get back.' I wrote it in blood, for god's sake."

"You should've been more specific." Fionna shot back, and Marshall Lee sighed, rubbing his fingers against his temples in bewilderment. She snuck into his house, she hid in the closet, she read his journal, she was in his room-

"I'm not mad, you know."

"What?" He snuck a glance at her, and he was surprised to see a tiny grin on her lips.

"I'm not mad. Just…grossed out."

"Huh. You know, that's not the reaction of most of the ladies I've dated," jokingly, he wrapped an arm around her shoulder and watched as that tiny grin became an amused smile as she halfheartedly tried to push him off, "many of them admit that I'm…well endowed."

"You said 'most'. So there's a few grossed out ones like me?"

"…Some," he shrugged, "but give it a minute, babe, and you'll be in the 'most' group in no time."

They chuckled together, and Fionna ruffled that dark, lifeless hair belonging to one of her best friends.

"Sorry I spied on you, Marshall."

"No harm done," he patted the girl on the back, and a second ticked by before she felt his freezing breath in her ear, "If it makes you feel any better, I spy on you guys all the time."

And with that, Marshall Lee locked his eyes on Geemo's screen which played some old pre-war movie, leaving a confused Fionna beside him, as she left a mental note to never leave the blinds open at night ever, ever again.

I LIED. There was no Cinnamon Bun!

But seriously you guys, if I were to make a few prompts NOT dealing with Fionna/Marshall, would you guys be mad? Leave your thoughts in the reviews!