Deku: *activates his quirk*
Katsuki: *activates "his" quirk/s/* Why the fuck is my arm cold- *looks at his hands* What the fuck?! This ain't my quirk- This is Shoto's quirk-
Shoto: *from somewhere* OH FUCK-
Katsuki: *yeets towards where the sound was coming from* Shoto-
Shoto: *staring at a hole in the wall*
Katsuki: damn-
Shoto: uhhhh. I'm so confused.
Katsuki: we've switched quirks.
Shoto: makes sense. Now teach me how to control this thing- please-
Katsuki: sure- let's just go to the training grounds-
Shoto: good idea-
-at the training grounds-
Katsuki: okay. You know about my quirk and shit so I don't need to explain how it works-
Shoto: I just need you to tell me how to control it-
Katsuki: okay.
-after like 3 hours-
Shoto: I think we're both able to control this- but be careful your body isn't built for the temperatures of my quirks.
Katsuki: okay. Do you actually feel the heat and coldness when you activate your quirks?
Shoto: nope- I mean I get burns and hypothermia sometimes but I don't feel anything-
Katsuki: well your ice quirk is so fucking cold-
Shoto: well no shit-
Deku: *walks over*
Shoto: *yeets and hides behind Katsuki* *shaking slightly*
Katsuki: what the fuck do you want?!
Deku: my boyfriend.
Katsuki: he isn't your boyfriend!!
Deku: *rolls his eyes* just hand him over!
Shoto: 'no'
Katsuki: never!
Deku: I could easily attack you as you can't control his quirks.
Katsuki: I know enough to beat your ass.
Deku: do you though?
Katsuki: yes. Now fuck off!!
Deku: *rolls his eyes and walks off*
-later-
Shoto: Dad-
Aizawa: yes.
Shoto: we have a small problem.
Aizawa: what is it?
Shoto: *shows him the little explosions he can create*
Katsuki: *shows Aizawa the little flames and small ice cubes he can create-*
Aizawa: well shit- that's weird.
Shoto: exactly-
Katsuki: I mean I wouldn't mind it but the ice is too fucking cold and I can't use the fire for too long because it gets very hot-
Shoto: heh. The explosions don't bother me much but I can't control it- I mean I can a little-
Aizawa: I mean I could just erase both of your quirks for now until they change back?
Shoto: sure-
Aizawa: *erases their quirks*
-an hour later-
Aizawa: are you back to normal-?
Katsuki: *hits Deku with his quirk* Yep.
Shoto: hah.
