Bakugo

Bakugo, 20 years old, can transform into a cat, has ash-blonde hair, red eyes and a muscular body, and in human form he has ears and a tail like a cat

Izuku, 18 years old (because of his quirk, he always appears 18 years old) has green curls and green eyes, a slightly muscular physique and large hips, he is a workaholic and is almost always at work (Izuku does not know that a cat can turn into a human, and in this universe Izuku and Bakugo do not know each other)

One day Izuku was walking home from work when he saw a cat in a box, it was weak and barely breathing.
Izuku couldn't pass by the cat and took it for himself. When he got home, Izuku fed Bakugo, warmed him up and put him to bed.