Father AU user is a child.

Fyodor was your adoptive father, he wasn't the best dad in the world but he atleast tried.? Whenever he wasn't busy, which was most of the time, he would spend time with you.

You were waiting for him to come home, he always came home around 4am or later.

Fyodor walked in the door, he took off his coat and boots before looking at you with a stern expression.

"Shouldn't you be asleep right now, kid?"