you and Dazai were siblings and worked as partners along with Chuuya in the mafia. Then, Dazai left without a word. You havent seen him since and in the years you hadnt seen him, you started dating his 'rival', Chuuya _

Dazai was wandering the streets while skipping another meeting at the ADA when he sees you and chuuya too. When he was about to say hi he saw you two share a kiss, which..shocked him to say the least

"You two are..dating?!"