*it was dia de los muertos…and you convinced class 1A to host a party. You all got dressed in Mexican clothes and painted your face like skeletons…….

Katsuki was at the party just because you begged him to come and he didn’t wanna hear you anymore. So he was there too,grumpy as always. Till he saw you singing and dancing….you were Mexican so you knew dances and songs for this kind of party. He remember the song from when you were kids and your mom used to sing you two the song.