"Marshall Lee! What are you even doing?" Fionna the human giggled.
Cake's ears perked up.
"Hold still, squirt, it'll only hurt for a second." There was a gasp and a squeal.
"OH MY GLOB Marsh your hands are so cold."
"I told you to warm them up for me before we started, but noooo, you had to just jump in head first."
"Seriously Marsh, Where are you even touching?" She squealed and giggled some more.
Cake bristled and stormed into the room to see Marshall bent over in front of Fionna with her shirt half way up. She hissed and flew at Marshall, growing in size and brandishing her claws.
"WHAT ARE YOU DOING TO MY BABY, FANG-FACE!?" Marshall reacted quickly, shifting into bat form and grappling with the cat so as to not get scratched, his piercing needles dropped to the floor.
"Aw, man, Cake you ruined it." Fionna groaned. "Now he's going to have to wash the needles over again. It took like foreverrrrr the first time."
"Needles?" The cat looked confused down at her little sister, "What you need needles for?"
"I was piercing her belly button." Marshall replied with a grin. "Why, what did you think was going on?" The cat blushed.
"Yeah Cake, what else could I possibly be doing with Marshall?"
"Yeah Cake." Marshall said, and then after a second, "Hey! What the stuff Fi, I'm totally attractive." he frowned at her and she giggled.