The whole time she had known Marshall Lee, Fionna had always wondered what his eye colour was. When he was in his monster form, they were red. But when he was in his normal body, behind those dark bangs she swore they were blue. Or maybe even green.
It wasn't like Fionna went around staring into everyone's eyes, but she liked to take note of the colour of the orbs her friends possessed. Like Gumball. Gumball's eyes were blue. A bright blue. Gumball blue. And so were Cake's. Monochromicorn had these awesome eyes that were different shades of grey and LSP's eyes were a really dark brown.
So it bugged her when she couldn't get close enough to see Marshall's eyes without it being weird. Everyone else had their hair away from their eyes. But not the big bad vampire king. She should have expected that from him, though. He was afraid of letting anyone in. Might as well block off the one way someone could have to glance into the windows of his soul.
After months of trying to casually see his eyes, Fionna had had it. While the dead man was playing his base floating a few feet away, the blonde marched up to him and flipped his bangs up. The vampire stared at her in both shock and disbelief, probably trying to figure out if he was more angry about her sudden move or shocked that she'd even attempt it.
But no matter what happened, Fionna finally satisfied her curiosity. She felt her breath hitch at her discovery and tried to cover up her surprise with a failing effort. His eyes weren't red, blue, or green. They were all the above. Like a kaleidoscope.
Blue surrounded the outside of his iris, and then it melted into a class of red and green. They were beautiful. It was as though a universe exploded just to create the man's eyes.
Fionna didn't know how long she had been starring for, but Marshall sat up in a sense, brushed the bangs away from her face and drew her to him, lightly kissing her forehead. She smiled and went back to playing the base. She rubbed at the spot with a blush and shy smile. For as long as she lived, she'd never forget those kaleidoscope eyes.