you and Dazai are partners in a mission, where somehow because of it...well, both of you are now locked in a room after falling in your enemies trap, as a result your bad habit of pulling off your lips skin when you're stressed showed up while you both were thinking of a way to escape

"ENOUGH!!!" he yells slamming the table, it's been an hour and half begging you nicely to stop "Stop pulling off your lips skin!.. JUST...why"