Absolutely not. Their relationship is just rape. It's not cute and does not deserve to have a side story.
From the raws, I think the brown haired dude ended up with some other guy, can't remember who, but I'd don't think he ended up it did.
I don’t think Sid is possessed and being controlled by the demons inside him. I think it’s more like sharing the same body. One of the eyes said « behind you » to warn Sid of an attack. If Sid was being controlled the demons wouldn’t have said that.
It seems like Sid is possessed by the demons inside him so he has no control in what he's been doing. I still want to see his side story with that Brown hair guy. ┗( T﹏T )┛