"Bro, it's a Halloween party, not class," Mondo said, scanning Ishimaru. He was wearing… what he normally wore, basically. There were a few minor changes, but nothing seriously huge. "Where's your costume?"
"I am a politician!"
Mondo groaned and turned to hit his head against the wall. Then he looked at Ishimaru again. "We'll get you some fake teeth and call you a vampire."
"Nonsense! That's very disrespectful to politicians," Ishimaru said, his eyebrows drawing together. "What are you supposed to be, anyway?"
"Ain't it obvious? I'm a werewolf! They're like big dogs, right? That's the thing? Buff dudes that turn into big dogs if they get moon on them or whatever," Mondo said. Ishimaru looked doubtful, but nodded. "Anyway, let's get down to the dining hall. I think Asahina set up the snack bar, and she's got decent taste."
The two of them walked down the hallways of the dorms quickly, Ishimaru looking increasingly more disturbed at each classmate they passed. The only classmate that hadn't dressed up was Togami, and when Mondo asked him what he was supposed to be, he just stared and said, "I am Byakuya Togami."
"You can't be yourself for Halloween, dumbass!"
"There's nothing else worthy of me," Togami said. He headed off and Ishimaru had to restrain Mondo.
"I'm good, I'm good," Mondo said after a few moments. Ishimaru let him go, and the two of them finally entered the dining hall.
Most of the girls, as well as Naegi, had helped out with decorating and setting up snacks, so all of them were already there. Ishimaru perked up at the sight of Ikusaba in a soldier uniform and went over to talk to her immediately. Mondo scanned the crowd, but even Leon Kuwata as a rock star or Chihiro as a flash drive appealed to him.
He mostly just wanted to talk to Ishimaru, if he was being totally honest. He ducked around toilet-paper-mummy Naegi – his foot caught on a piece of toilet paper and unraveled an entire leg – and headed over to Ishimaru talking to Ikusaba. He was completely oblivious to Junko Enoshima the succubus at his side.
"Oi, Ishimaru," Mondo said. Shit. He should've gotten some punch. "Let's go get some punch."
Enoshima giggled and if she hadn't been a girl he probably would have punched her.
He grabbed Ishimaru's hand and pulled him toward the snack table. Asahina was also a werewolf. "Oh! Oowada! We match!" she said. She shoved a doughnut in her mouth. "You-look-nishe-Ishi."
"Thank you?" Ishimaru said. Oowada got them both a cup of punch and nearly spilled it all over Ishimaru when trying to hand it to him. "Brother! Be more careful!"
"Right," Oowada said, feeling his face grow hot. The two of them were silent for a while, and then Ishimaru said something that was really weird.
"Isn't mistletoe for Christmas?" he asked, looking up. Oowada followed his gaze. Yeah. Someone had hung mistletoe from the ceiling, and they were right under it. "Do the rules still apply if it is not Christmas? They have to, right?"
Ishimaru was getting worked up, so Oowada really just kissed him to shut him up. Then he realized that he'd kissed Ishimaru and knocked over the entire row of snack tables. He landed in the punch bowl, and Ishimaru stared at him.
It was dead silent until Ishimaru spoke.
"While I appreciate you conforming to the rules of mistletoe," he said. "You should perhaps refrain from breaking the tables."
This was requested by a user on Tumblr, who wanted an Ishimondo Halloween party situation! Costumes are fun to think up; I just did a Battle Royale one, too, and it's all so fun.