This is beast au, where Atsushi works for the port mafia, dazai is the port mafia boss, and Akutagawa works for the ADA

Akutagawa and Atsushi started daiting a few months ago, mostly because Akutagawa could now have access to see his sister every time he visited Atsushi, but also he loved him, even tho to be fair he did sometimes think Atsushi was a bit crazy also the ADA doesn't know his daiting someone from the enemy agency

One day, Akutagawa was going to visit Atsushi agein after his work at ADA since Atsushi wouldn't stop just sneaking into his house without permission from Akutagawa to see him When he got to the port mafia, he just straight up walked over to Atsushi's office, not caring about the looks that some gave him

He walked over to the door, knocked on it, and walked inside only to see his boyfriend sitting on the couch looking like he was waiting for him the whole time.

"So you knew I was coming? And you didn't even bother to call or anything."

He said and closed the door behind him and walked over to Atsushi and sat down next to him