Not to skk post on main but that scene from Dead Apple made me insane for I think a slightly different reason than most...
Ok so. Gonna be honest. When I first watched this, the ah... positioning... did not occur to me at all, other than thinking "that looks really uncomfy :/".
I was too focused on what Dazai's hand does here. He first pushes him. Ok so he was trying to stop him from getting up and losing contact due to the fog. Cool. That serves a practical purpose.
But then Chuuya falls unconscious and Dazai's hand loses that contact for a second before he lowers it back down to rest on his head.
The thing is, there's no need for him to do that. Chuuya is already in contact with Dazai's legs and his ability works through clothes. Moreover, it wasn't just a continuation of pushing him down - there's a slight delay before he sets his hand back on his head.
He sets his hand there just because. And, due to the delay/hesitation, it appears to be a conscious choice to do so as well. Chuuya's out. There's no one around to act for.
I watched that and went holy shit that's genuine, isn't it? It's such a simple gesture of fondness, maybe even a bit of protectiveness, but it means a lot from someone as emotionally closed off as Dazai.
It's... weirdly sweet. He appears to have done it after Chuuya lost all his friends (again...) during DHC in the manga adaptation too, which is... :(
And now, with seeing Dazai immediately start playing with Chuuya's hair in the latest Fifteen adaptation, it also doubles as really funny to me. He saw a chance to touch his hair again and took it. What is wrong with this man.