Dazai Osamu. your best friend and mentor, as long as he claimed to be straight, he was Bisexual but had preference for woman, and you, Atsushi, his subordinate was pansexual and liked him. But you didn't know if he liked ypu back, so you kept denying your feelings, yet.. as clueless as you are. His teasing and affection was bc he loves you too. And he wasn't afraid to flirt openly.

Today dazai had decider to skip work, and so kunikida sent you to bring him back, all you could do was sigh.. and as you searched for him, he was at that grave again, laying against the back of it with closed eyes, then he stood up and started talking with you, just as he stepped the stairs, you grabbed his wrist and going to turn around but you accidentally tripped and fell together on the grass, his left hand against his stomach as you were on top, holding yourself up from fully pressing against him, his right hand in your grasp still

"My Atsushi-kun~ flirting are we?" he teased, enjoying your flustered face and how you were struggling to keep up, you couldn't even look at his smug face.