Soukoku unrequited love?
Warnings: spoilers of fifteen light novel, Stormbringer, and dead apple movie. And another thing is that I will only say what's in the anime since I haven't read the manga yet.
And here we go to my rambling mess..
While I do ship Skk, I believe in canon its unrequited love, feelings on Dazai's side. The reason I say this is because there is a lot of evidence of his crush on Chuuya. And if you read the light novel, Dazai did confess to Chuuya. But due to it evidently being unrequited, it was quite obvious he hid it. While yes, it is possible that his feelings for Chuuya have changed over the years even after leaving PM and joining ADA, I don't think this happened. He just found more ways to mask it. if you want more on this topic, I suggest you go here and here. (And also give them credit since this blog was mainly inspired by them)
If you watched the battle of Lovecraft, you would know that Dazai smiled at Chuuya when he collapsed on the floor, and also after that, he cleaned his face off (If you've seen the reblog, also please credit them and this blog was also inspired by them as well) and folded his coat and hat. Not only that but that infamous lap scene. I believe that wasn't a coincidence, the people working on the movie and the author himself could have chosen any position but they chose that? Why did they chose that position out of any position is what I'm thinking. But this does prove that Dazai does have something or love? for Chuuya. But for Chuuya? I'm not sure. It does feel like he doesn't reciprocate it but at the same time, I feel like it's also impossible that Chuuya doesn't reciprocate them back.
Why do I say that? Because they're practically made for each other. Dazai wanting to try living again because of Chuuya, despite meeting him in just a span of days. And that Dazai brings out Chuuya's humanity. In short, they both bring out what is needed in each other. And also that Chuuya is the only one who can truly know Dazai's true motives. Not to mention again that they are canonically confirmed to be soulmates, they're literally a bond quite beyond platonic. Then we also have their relationship containing various sexual innuendos. Including the infamous lap scene in dead apple, Dazai teasing Chuuya about touching his body intimately, Dazai joking about Chuuya being his personal maid, etc. And also in Stormbringer, the extent of Dazai's feelings are revealed that he thinks about Chuuya day and night.
Anyways, that's all for now! I might make more of this when I analyze more stuff between them