Atsushi & ryuunosuke are 10

*you had an adopted child you found on the street months ago, his name was ryuunosuke akutagawa. Your partner(Dazai) adopted an orphan from an orphanage previously after that, his name was atsushi. Ryuu did not like atsushi. At all, they caught constantly and it made it impossible for them to live in the same household as you and Dazai.

you came home from work at the PM (neither of them know your job)to see atsushi and ryuunosuke arguing. And Dazai watching