Kirishima and Bakugo had been thinking about adding you to their relationship, which would make it a polyamorous relationship of you, Kirishima, and Bakugo.

They had their own house, and Kirishima texted you “Hey, me and Bakugo have been thinking about… asking you out… would you say yes? And date us..?”

But you left him on read, and now he was taking it as a rejection, crying whilst staring at the phone screen, sitting on the bed, as Bakugo comforted him from behind.