Kirishima would definitely call you his pebble and I feel you would call him your big boulder or sharky (or if your really kinky daddy shark)
I also think you would have a small rock collection. So like every time you miss him you would get a rock and put it on your shelf or something.
He would use his quirk to protect you and ya know ✨✨
He would def talk to bakugo about you and bakugo would never show it but he would be a bit happy for kiri.
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Mha head cannons
Fanfiction| REQUESTS OPEN| Just a lot of mha characters and what they Would do with y/n and with out y/n (some may be ✨spicy ✨ this gets updated nearly everyday