Reptile family

Izuku hasn't had an easy life, constantly mocked and ridiculed for being quirkless, the only things that brought him joy in life was studying heroes, his mum and his girlfriend, but after a tough day at school his girlfriend wanted to cheer him up by being his first, but the morning after their night of passion Izuku learned too very important things, he had a quirk all along and that's not all he gained that night.

I will not be writing lemon, but it is implied that it happened.
And by the time they get into UA, they will be 18 so it's a college instead, look up the consent in Japan it's much higher than a few other countries.