(Disclaimer! I own nothing of Adventure Time)
Finn came to Marceline's pad.
"Marc, I'm here," he said, "Where are ya?"
"Be down in a sec," said Marceline.
She was finding an outfit.
"Aha," she said.
Finn waited in the music room.
"Coming down now," said Marceline.
She came down wearing a baggy flannel revealing a short tank top underneath.
Finn was blushing and almost got a nosebleed.
"You like?" she asked.
"Y-y-yeah," said Finn.
"Thanks for coming to record Finn," said Marceline.
"No problem," said Finn, "So ready?"
They spent the next few hours recording music.
Finn got lost in Marceline's beautiful voice and looks, and…. Something else.
"You ok Finn?" she asked, "I think the beat got messed up."
"I'm ok," said Finn, "Its just…."
"Just what?" asked Marceline as she got closer.
Finn was blushing more.
"I guess I got…. Distracted," said Finn as his face turned red.
"By what?" asked Marceline, "You can tell me anything."
"Well…. By….." said Finn, "Your chest."
He gulped and closed his eyes and flinched but Marceline didn't do anything.
She actually grinned.
"Well, do you want to touch them," she asked.
Finn blushed a darker red.
She came closer.
"Go ahead," she winked.
Fin started to kneed her breasts.
"Wow," he said.
He then squeezed them lightly.
Marceline moaned soft knowing it felt good.
"You can rub them harder," she said.
He rubbed them harder causing her to moan a little louder.
The two of them then shared a kiss as Finn continued to touch her chest.
Marceline felt her nipples start to get hard.
She unzipped her shirt and showed him her bra.
"Are you ready to become a man?" asked Marceline.
She pushed him to the couch and got closer.
"I think its time I taught you about what boys and girls really do," said Marceline.
Finn blushed madly.
"I'm gonna make you a man," she said as she got closer.
She then started to laugh.
"Your reaction was so cute!"
"What the…." Said Finn.
Marceline kissed his cheek.
"You're a funny guy Finn, but I don't think you're at that level just yet," said Marceline.
Finn laughed.
Marceline snuggled.
"I kinda wish moments like this would last forever," said Finn.
"This moment with your hand on my boob?" asked Marceline.
"Yeah," said Finn.
"I think that's more your moment than mine," said Marceline.
"Yeah," said Finn.