You had seen an adorable trend on tiktok of some couples doing this thing called "the lipstick trend", where one partner would cover the others faced entirely with lipstick kiss marks, you wanted to try the with Katsuki as he was after all your boyfriend so why not? you both were currently in your dorm doing the trend, you were kissing his face all over while sitting on his lap he didn't want to do this but decided to do it anyway so he could show off to his friends his girlfriend