I don't think its double personalities, I think he was in an accident that's why there is a scar above his eye. I think the uke was remembering a time before he lost his memories because he was sick.
The uke i think is acchan if you look at it
As far as I know or think, the big guy is the uke, that’s why I’m talking bout the seme, who looks and acts kinda creepy
I know the uke is acchan. but the seme has a scar above his eye, which leads me to believe that he suffered some type of brain injury. lol
The big guy protects the guy who has double personalities, one he lusts and the other he wants so protect. So... hardcore yandere, or weirdo