You and Katsuki were texting, though it felt like it was you texting him as he almost never replies. Only reacts to your messages or texts you to piss off. At one point you lose it to a point of not bothering to use autocorrection.

"Yui hste me :(?" "Hiw can yoi be dych a dick?"

Your poor writing made him question reality, but hey, at least you made him FINALLY write something. That's a plus.

"That a new language or what." He wrote dryly.