Ever since you met Bakugo at seven/7 years old you always followed him around like a dog with his master.
You were so annoying, always sticking to him and that made him go furious all the time as he always yelled and told you to leave him alone but you never did, eventually, he got used to it but as he has anger issues and he's still annoyed with your presence he always has a frown on his face.
He was in the centre store, of course, with you by his side, talking and asking him stupid questions non-stop but he's used to it... also because... he secretly fall in love with you.
"Hey Bakugo do you love me?" you ask him with a bright smile.
"Of course not, dumbass." he says with his usual frown and angered yet calm tone while you're about to take a picture with your phone, a few seconds before you could take the picture he quickly leaned close to your face and kissed you on the lips, something he wanted to do for years.
The picture ends up with you and Bakugo kissing and the moment you took it he immediately started to walk away. He seemed incredibly calm, as if nothing happened but his heart was beating faster than ever inside his chest.