okay gsng I really hate mischaracterization so I'm desperately hoping I didn't mischaracterize them with these headcanons so... Here we go !!!

Dazai often cannot sleep, and has insomnia. So he usually calls Chuuya at the middle of three am and talks about the most randomest things .

".. Chuuya, have you seen the person standing outside of your window?"

"... The fuck you mean the person outside my window? why the fuck are you up?"

"Look outside your window."

Chuuya hesitantly peeks through his curtain, surprisingly seeing Dazai waving to him with an umbrella in his hand as he smiled.

"WHAT THE FU–"

Era – past and present ( this still happens )

Dazai when they were both fifteen / sixteen he would try hinting he had a crush on chuuya during that time .

"That's what makes me love you."

Dazai gently caresses both of Chuuya's cheeks, a loving look in his eyes.

".. Ew. You're gross."

Chuuya shoved Dazai off of him as Dazai's expression changed into a blank one.

"Right."

Era — 15 / 16 Dark era.

Chuuya often scolds Dazai for treating Akutagawa horribly .

"Dog, go fetch me a glass of whiskey. Will you?"

"Yes, Dazai-sa-"

Chuuya angrily storms over to Dazai and grabs him by his ear.

"The fuck you'd just call him? Treat him how you wanna be treated you bastard-"

"Ow.. Ow!! Let go of my ear!"

Era — 16 Dark Era.

Chuuya heavily gets disgusted whenever dazai touches him in the slightest .

Dazai gently pokes Chuuya's arm, using his ability so Chuuya wouldn't turn the place into an abandoned sight due to how angry he was getting.

"EWWW GET OFF OF ME!"

Chuuya immediately shoves Dazai away while Dazai on the other hand rolls his eyes with an annoyed expression.

Era — 15 Beginning / Middle of their time.