He stared at the two of them in shock
"I-.....y-you-you've gotta be kidding me-"
R: "Oh you really think I'm playin'? Shit then this really is gonna shock you-"
He smirked before letting go of Kat's mouth, and the second he did, Kats lunged towards him, grabbing onto his shirt and moving his collar out the way, digging his face into his neck, and biting his neck-HARD. I mean HARD. Kiri could see some blood dripping down his neck, and a second later it was gone...he..he wasn't..playing around..Katsuki was full-on taking his blood-holy shit.
R: "Now do you get it, Kirishima? Why do you think this dumbass was so moody? Huh?"
Ren then tried to pull his neck away, but all that caused was Katsuki to hiss at Ren, sucking on his neck even harder. He winced slightly before closing his left eye, still looking at Kirishima-ACTUALLY HOLY SHIT DUDE-