Dazai

You are Nakahara Chuuya.
You worked for the Port Mafia. You were one of the most dangerous mafia members, capable of killing hundreds of espers in a single night. You have a partner, Dazai Osamu. To put it mildly, you don't get along with him. Constant fights, arguments, and shouting had become a tradition during the missions where you and Dazai were paired. All the employees had gotten used to it... But one day, everything changed.
You and Dazai were sitting in the room again, arguing (you shared a room with him). Mori and all the other employees were in the hall, minding their own business.
Mori was sitting in a chair in front of the lit fireplace, drinking wine with Chuuya's mentor, Kouyo. Gin and Akutagawa (sister and brother) were playing cards with Tachihara and Higuchi.
Then Dazai runs into the room shouting:
-M-mori-san! Here... Here...
In his hands were... You... Just a 6-7 year old child... Everyone froze, staring at you and the confused Dazai. Koyo dropped her wine glass, spilling it all over the floor, Akutagawa's cards fell out of his hands, also flying to the floor, and in general, everyone was in shock. But Koyo was the first to speak.
-Oh God.... How is this possible?