The sun... so bright... blinding... OH GLOB, THE SUN!
"MARCY!?"
"Huh... what the..."
Her skin was already starting to blister.
"Oh, stuff, hang on."
Finn covers them both with the blanket, and they meet under it in the dark.
"Mornin, dweeb."
"I need to be more careful next time, you could have-"
"Dude, I'm the one who totally threw caution to the wind and didn't draw the blinds before bed. It's not your job to take care of that stuff."
"It is now."
And he holds her close as her flesh regenerates and the red bubbles fade.
"You realize I'm like, about 980 something years older than you, right? Since when do you take care of me?"
"Since you're my girlfriend, and it's my job."
He kisses her softly.
"Look, I get that you're the heroic gentlemen and all, but-"
"No buts. your burdens are mine now, and mine are yours. We share them, and that makes it easier."
"But-"
"I'll show you a butt."
And then he's squeazing hers, kneading the soft flesh of her round cheeks with his fingers. He meant it as a joke... so when she lets out a low, husky groan, he pannicks and stops.
"S-s-s-sorry..."
"Dude, it's cool."
"But I just grabbed your-"
"And?"
"But I didn't ask and-"
"And?"
Then she reaches around behind him and grasps his bum too, placing her cold hands over it; he squeals like a baby bunny and squirms away from the icy touch.
"WHAT THE ZIP ZOP!?"
"Payback."
She smirks, and he grumbles something about her unfair advantage, what with her skin always being so chilly.
"Stay here, I'll close the curtains."
He crawls from beneath the sheets, shivering in the cool morning air as he draws the shades; the clock only says 6am, so he slides back into bed with her in the semidark room.
"Finn, don't we have to get up?"
He wraps his arms around her and pulls her close to help warm her up, and she sighs.
"Nah, it's only 6. Jake will come up around 8 and tell us to wake up."
"We should probably get dressed before that happens."
He runs his soft, warm hand down her back, tracing her spine with the tip of his finger, and she quivers in his arms.
"Clothes are lame."
She nods in agreement, pressing their bodies together to steal all his heat as she kisses his lips.
"Marcy..."
"Hmm."
"Today's like, the day."
"I know."
She sighs deeply, nuzzling against him and hugging him so tightly it almost hurts; she never wanted to let go.

It's about 8:30 when Jake comes walking up the stairs to the bedroom and knocks on the door; thank goodness, he had the decency not to just burst in. Finn is the one to respond, albiet a little groggily, as he had almost just fallen back to sleep in her arms.
"Yeah, dude?"
"Breakfast, you two."
"Okay, we'll be down in a second."
He pulls the blankets off and disentangles himself from her embrace; she's snoring ever so softly, her eyes closed, a faint smile on her lips. Finn gently shakes her shoulder.
"Mar mar... time to get up."
"Huh... no Simon, five more minutes..."
"Marceline, Jake made breakfast."
"Huh? Oh, yeah, hang on Finn."
She sits up, stretching, yawning. He sits on the edge of the bed, quickly dressing himself.
"Mornin, sunshine."
"Ugh."
The human chuckles as she rummages through his drawers. Eventually, she finds...
"Woah, Finn, you wear dresses?"
It's a simple white one piece, two straps and a ruffled skirt that went down to her knees. He shakes his head in confusion, turning to look at her.
"No, I don- oh."
He frowns deeply, resting his chin on his hands.
"Then where did it come from, dude?"
He sighs, flopping back onto the bed and staring up at the cieling as those feelings boil through him, making his skin crawl, making him want to punch things.
"It's, uh... well... Phoeb- I mean, Flame Princess left it here. I kind of forgot about it."
"Oh."
"Yeah."
She puts it on, and grabs his hand to pull him back up into a sitting position as she smiles.
"Dude. Relax. She's old news."
"I know, I know, I just feel bad for not throwing it out or giving it back and..."
"You forgot, man, it's no biggy. Besides, waste not want not. Now I have something to wear besides your ripped jeans and sweatshirts."
She does a slow turn, showing off the way the dress accentuates th slim curviture of her body. He stares, wide eyed, and slowly nods.
"Marcy, you look... gorgeous."
"Man, you're like, obligated to say that, and stuff."
He stands up from the bed, pulling her into a hug.
"No, I mean it, Marceline. You wear it better than she ever did. You're beatiful."
She grins wide, looking up at him. The way he reassured her, the way he KNEW that this would bother her, the way he immediately reinforced his lack of feelings for his old love...
"Finn."
"Yeah?"
"You're literally the most amazing guy in the entire world."
"And you're the smartest, most beautiful, gorgeous, kind, caring girlfriend a guy could ever ask for."
"Flattery opens every door, but-"
"No, Marcy, I mean it. The way you act around me, like I'm not just some stupid kid, the way you treat me like I MATTER, like my opinions aren't dumb, like I'm someone worth respecting, it's..."
He trails off, trying to find words for the way she makes him feel, but he cant, so he kisses her instead.
"Wow..."
"Yep."
"I didn't know-"
"Yep."
"So all those times with Jake and Bonnie and the others, when they talked down to you..."
"And you would stick up for me."
"Because you're really flippin mature for a kid your age, Finn! You're responsible, and noble, and kindhearted, and you make sacrafices for the people you care about! That's, like...
"Like what?"
"Like you're more of a man than Ash, or any of those others ever could have been."
They stand there for a while, just enjoying this moment, the feeling of holding each other, before Jake knocks on the door again.
"Hurry up, you two, it's gonna get cold!"