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There was no getting out of this.
He wriggled and squirmed (and, predictably, yelled) but Dazai would not let him win.
"WHY THIS COSTUME!!"
Chuuya already thought Halloween to be pointless and childish, when was the last time had he even seen kids trick or treating? But Dazai wanted to go to a party. Costume party.
Dazai put his hand over his mouth, muffling his voice.
"You look..so adorable..chibi.." Dazai said, or more like giggled, as he tried to hold back completely cackling over Chuuya's appearance.
"SAY THAT TO MY FACE!!" He pried Dazai's hand off his face, them both struggling between laughing and complaining. Chuuya's ribbon came undone again.
"Ah you're so careless~"
"You're the one who tied it-!"
Dazai picked up the ribbon again, looking over Chuuya.
"Hm.."
While the cat costume certainly fit Chuuya's personality Dazai was not satisfied with it, oh no, he wouldn't stop at ears and a tail. He was going for humiliation.
"It should go in your hair instead!" He exclaimed, reaching out for Chuuya's head.
"No no no nonononono!"
Chuuya dodged in classic cat fashion, he did tend to land on his feet a lot. Dazai kept up the chase, his similarly themed dog ears bouncing with him. Chuuya would not let himself be the only one humiliated, and while Dazai didn't show it, he knew he hated it.
"You're the stupid one who had a ribbon on hand! You wear it!" Chuuya held back his hands by gripping his wrists, keeping from the hanging end of ribbon as if it were poison.
"You're the one who made me be the dog when *you're* obviously-"
"Obviously not! I'm not-"
"-And really barky, just barking all the time-"
"Yeah, yeah *I'm* the-"
"Yes you are!"
At this point Chuuya just pulled on Dazai's ear, his real one not the stupidly droopy dog one.
"Is this what I get for trying to have fun?!"
Now Chuuya was laughing.
"Uhh...what do I even say?" There suddenly came a voice from the door, now open and revealing Atsushi. A very exasperated one, not that he made any other expression around these two.
"You're gonna be late, and well..sorry for interrupting."
"Ah see we were just leaving!" Dazai straightened himself out and swatted Chuuya's hand away from his ear.
"Uh huh.." Chuuya scoffed.
"Kunikida said you'd be arguing.." Atsushi smiled nervously, he'd much rather leave the scolding to Kunikida.
"And we're done! R~ight Chuuya?" He purposefully dragged out a few syllables, emphasizing 'Chuuya.'
He rolled his eyes, "...if you don't beat me there first!" He made a run for downstairs.
"Oh-!" Dazai couln't think of a comeback and just ran after him.
They both whirred past poor Atsushi, who had more than one question over their costume choices. He didn't dare ask though.
The ribbon laid left behind on the floor, maybe next year...?