i feel like at some point when all might and izuku started training together when izuku got into UA they started going on outings together to like boba shops and restaurants and when katsuki learnt abt OFA he started joining them too and they all went on outings together but then at some point all might could feel the romantic tension between those two so he started talking about being very busy or feeling too sick to go and bkdk just started going on these outings (read: dates) alone and after a while it just became their thing and whenever someone asked abt them going on dates every other day they’d deny it even tho they both knew they were dates.