A fic written from 17? dazai's perspective where he finds out chuuya after everything has also become suicidal but in the doesn't tell anyone way,
as in 17 year old dazai finds his crush who he was just laughing with two hours ago, trying to commit suicide. He freezes up because what? Why? And then on instinct saves chuuya.
Example:
He suddenly relises why chuuya was 'jokingly' agreeing to the double sucide he had proposed during their latest misson, But it also didn't make sense blindly loyal life loving chuuya suicidal? It didn't make any sense.
He kept a close eye on chuuya after that, focused on his every movement even more than before. However he didn't know what to do when chuuya was away and he lost his best friend, he of course listened to oda and ran away but he waited for chuuya to get back.
When he talked to chuuya he really wasn't expecting to end up with chuuya as his rich husband and him in the ada, chuuya is not in the mafia anymore mind you his husband is rich in a respectable way.
The ada hadn't met his husband yet, they didn't even know about his husband to be honest, it's not like dazai hid chuuya from them. To be fair dazai didn't fluant the fact he was married either, even his ring was almost never in view.
And him flirting with women didn't help even if to him it always clearly a joke. He would never cheat on chuuya, Chuuya & his promise was his reason for living and chuuya's was him, they were even planning to add another reason soon.