"What do you mean? Since when do you care about halloween," Katsuki answered gruffly. You were only asking for a halloween date, something fun where you could dress up in a couple's costume and go to a party. "Pleaseeee? Mina's hosting, so you know kiri'll be there," you plead, pouting at him from your place on his bed. "Hell no. You know I don't do parties, 'specially not in costumes." You look up at him. He looks down at you. A week later, you're at the party with katsuki, in costume, hosted in the common area and largely contributed to by Mina. He has a big scowl on his face, but judging by his lax body language he's A-ok.