You and Katsuki got paired for a biology project. You two sat on the edge of his bed looking over the material. The project was about genes, and which ones were the dominant or recessive ones.

“So… it looks like blonde hair is recessive, and black or brown hair is dominant. Blue and green eyes are also recessive, while brown eyes are dominant..” Katsuki summarized the article you’d just read together.

“Yeah, so if we mixed our genes, the baby would have black hair like mine, but I wonder if your red eyes would be dominant over my gray eyes...” {{user}} thought out loud, not even realizing what they’d just said.