tachihara calling fukuchi for romantic advice so he knows what NOT to do. fukuchi fumbled fukuzawa and tachihara is not interested in fumbling anyone.
tachihara refusing to tell the hds who he's dating, not because they'd be mad, but because they would make fun of him.
tachihara telling fukuchi who it is, and fukuchi getting a slight pain in his chest because oh fuck that's an agency member.
tachihara going to hirotsu for advice because the hds were no help and he is sure no one else in the mafia would be able to help.
fukuchi realising a bit earlier on that tachihara is conflicted and might betray him because tachihara hasn't broken up with atsushi.
teruko figuring it out and annoying him about it. her demanding hush money(sweets).
lucy kidnapping tachihara so that him and atsushi could talk face to face.
kyouka approving of tachihara because he's not akutagawa and the one time they met he was pretty sweet to her.
atsushi telling the tanizaki's about it and naomi getting excited for him. junichiro warning atsushi to be careful, but also letting atsushi rant about him.
atsushi keeping it a secret for tachihara, who doesn't really want the mafia members to know, and tachihara giving kyouka hush money(sweets).
higuchi finding out and getting a picture of them on a date. she's never seen tachihara look so gentle.
atsushi getting advice from fukuzawa about places to take tachihara. fukuzawa never asking who it is.
tachihara never making atsushi feel out of place or unwanted because he knows that feeling. atsushi making tachihara feel important and loved because he knows how it feels to not feel that way.
dazai finding out that atsushi is dating someone and trying his best to figure out who it is. he never does.
ranpo demanding hush money(sweets) from tachihara after he figures it out.
atsushi calling tachihara pretty, tachihara writing a poem for atsushi.
them being able to vulnerable with each other.
atsushi claiming he doesn't like guys, then tachihara does something stupid and atsushi is like. fuck i do. tachihara already knowing he likes guys but refusing to admit his feelings for atsushi until atsushi laughs at something stupid tachihara did and he goes. fuck.
tachihara being more 'himself' with atsushi because there's less of a need to put on an act. atsushi seeing the softer, kinder side of tachihara.
them making sure that the other always feels loved.
atsushi talking to kunikida about how sweet how boyfriend is. kunikida just being happy that the kid found someone who loves him, not particularly caring who it is.
kunikida whacking dazai upside the head because he still hasn't given up on trying to find out who the boyfriend is.
jouno telling tachihara that he could use this to their advantage. tachihara refusing to use atsushi like that.
atsushi asking tachihara is he actually happy with the port mafia. atsushi wanting tachihara to join the ada because he knows it would be better for him. tachihara saying that the mafia is where he belongs, that he loves it there.
atsushi moving in with blind!tachihara so that he doesn't feel alone 24/7.
yosano and tachihara interacting before doa arc and yosano teasing him about atsushi just because. yosano teasing atsushi about tachihara. yosano not demanding hush money because she gets that they don't want many people to know.
gin finding out tachihara had a boyfriend and loosing their shit. they don't know who it is, but who the fuck would date tachihara. higuchi later tells them it's the weretiger. gin dies of laughter on the spot.
them keeping it a secret but literally everyone in their organizations but tecchou dazai and akutagawa knows. tecchou is tecchou, dazai and akutagawa is deliberate.
chuuya telling tachihara that he'll enact vengeance for him if atsushi hurts him. chuuya helping tachihara with what not to do.
mori and elise helping tachihara with date fits. kunikida and kyouka helping atsushi with date fits.
kouyou telling tachihara not to get too attached because that's dangerous. tachihara agreeing but gets too attached anyways because that's just who he is.
kunikida having a sit down with tachihara when he finds it out. kunikida leaving that sit down approving of tachihara. tachihara didn't understand half the shit kunikida said.
hirotsu talking to atsushi about it, telling him that he's glad that atsushi is making tachihara happy.
tachihara getting the weirdest advice from paul.
atsushi getting advice from dazai, and ignoring the advice because he doesn't trust that.
atsushi getting actual advice from the cafe owners, because they're married and thus actually knows how to do it.
atsushi being very physically affectionate to tachihara, and tachihara clinging onto it. tachihara being hesitant to be affectionate, but trying to be anyways.
tachihara telling atsushi that who cares wether or not your life has value, you live anyways because you like living and you like the people around you.
them going on walks after work.
them hanging out on their days off.
them getting into a fight because tachihara lied and atsushi isn't okay with that. tachihara explaining everything to atsushi in person.
atsushi refusing to see tachihara as anything but tachihara. even after finding out everything the government did to his body.
atsushi calling tachihara 'michi', tachihara calling atsushi 'sushi'.
tecchou finding out post doa because tachihara is going everywhere with atsushi. dazai still not knowing. akutagawa finding out post doa because a very tired atsushi refers to tachihara as his boyfriend. akutagawa not caring by that point because he's also way to tired for this shit.
dazai being annoyed that everyone is trying to keep it a secret from him. it's not even because they don't want him to know at this point, it's just funny.
them loving and understanding each other in a way not many other people could do.