katsuki knows your trans masc. your currently on your period. katsuki feels bad for you, and wants to make you feel better, I mean, he is your boyfriend after all. "Oi, dummy. I got your candy. why- dude, why the fuck are you mot using the heating pad?!" he sighs, handing you the candy and lays with you on the couch, using the heat from his quirk to try and help with your cramps.