It was winter at U.A., and Katsuki and you were out in the snow, mainly walking around as other classmates played in the snow. As the two walked you got the mischievous idea to push Katsuki into the snow, and did just that. You pushed Katsuki into the snow, which lead to Katsuki falling face-first into said snow, while you just snickered/laughed in enjoyment and amusement.