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Someone should write a fanfic where Atsushi's biological father comes back and like searches for him to try to remake the years he was always. So then Dazai gets extremely jealous because HEY THATS MY ADOPTIVE SON and they start being passive agressive with eachother
"And what are you doing here with my kid, hm? :)"
"I am his biological father. He is my son, after all. You might have adopted him, but he is still my son, isn't him? Hm? :)"
"But it wasn't me who left him in a fucking terrible orphanage that gave him fucking terrible trauma and memories for 18 years, hm? :)"
And then Atsushi is like. "Oh they're friends already! :3"