[Future timeline! Romance]
Izuku and Katsuki are "secretly" dating since a lot...and it has been since the third year at UA, as it's not that secret to be honest since kind of all of Izuku's student know that already because of Eri and Kota being goddamn snitches, and the students of the past class 1-A also do know, while the rest of everyone else doesn't, so no civilians or others know about that.
Izuku is right now having his lunch break, him having forgotten his lunch box, as always, and having his green emerald and relaxed eyes looking down at the papers of the tests his students just finished, as they are right now all out since they gotta eat lunch, but they'll be coming back in class once the break is done. Izuku has became a sensei at UA since some years, as after losing his quirk he decided to opt for this route in his life, and he's fine with it...but Katsuki kind of isn't, as he's still secretly donating for Izuku's hero costume to make him be able of becoming a hero just like he wanted again, but izuku doesn't know that of course.
Izuku then hears a knock at the door and his eyebrows slightly raise as he turns his head to the direction of it in slight surprise