izuku and katsuki genuinely don't realise how domestic they are with each other until people start pointing it out. they think their dynamic is normal; they're best friends who live together, they cook meals together sometimes and bring each other coffee when they have lunch breaks or when one has gone out, they get groceries together, play video games, and sometimes they share a bed because the other has had bad nightmares and can only think to hold the other person, and sometimes katsuki wordlessly hands things to izuku that he clearly needs without the other asking for it, or he folds his laundry for him, and sometimes izuku leans his head on katsuki's shoulder when he's tired during movie night, it's not weird, none of it's weird to them, it's been that way since after they graduated from UA. but the others notice the soft gazes katsuki gives to izuku when he isn't looking, and it's strange because he's never looked at anyone like that before except his best friend. and there's a little sparkle in izuku's eyes when katsuki makes him laugh, because katsuki isn't known to be funny but izuku always laughs at his jokes or his grumpy attitude and he just looks so happy around him. everyone notices but them,,,until they both get told and they have to awkwardly tip toe around each other until one of them breaks the tension and after that, they're inseparable again
[texting]
Dina: Do you have plans for tonight?
Ellie: No
Dina: Want to come over? 😏
Ellie: Sure, what you wanna do?
Dina: 👅🍑
Ellie: I don't like peaches, they have disgusting hair. Can't we have a pizza instead?
Dina: OMG, ELLIE 🙄
Ellie: What?
Dina: Just come over and I'll show you