Bakugou and izuku have been close since childhood.Since izuku was born without a quirk a lot of people would bully him and bakugou used to as well until he stopped because his feelings got in the way.izuku and bakugou started dating in middle school around the age of 12. Their parents know about their relationship and support them. Bakugou was embarrassed to be Homosexual so that’s why he asked izuku to keep their relationship secret in school but not from their parents.