Ngl sociopath character not that bad

So the younger brother is definitely a sociopath but written actually not bad. It seems that it's evident ever since his childhood that he couldn't really feel anything for anyone. Other than his adopted older brother. What I find interesting is that things that would typically be a red flag and other sociopathic obsessed male leads, there's like weirdly an explanation for it. For example, he constantly tells his older brother to just stay in the house and he'll take care of him and there's no need for anything else. Now typically that would be the worst thing in any other BL. However, here the older brother is a nymphomaniac vampire and whatever he leaves the house monsters try to give him blood I don't know. So the younger brothers worries are actually very warranted and the older brother is your typical stupid Uke. So he never listens when he should and for some reason hasn't realized that his brother is a sociopath.
What I find interesting, is that if they weren't in this monster written world. I think the younger brother would actually act somewhat normal. Unlike other sociopath Seme's he seems to actually care for his love interest. Obviously we're only 11 chapters in and to be honest I won't continue reading. Well maybe because I'm curious about the older brothers relationship with to the monsters. Although, he does have the typical mindset that his brother is his. I feel that it's more rooted in the situation that they're in and that they're really isn't anyone that would properly take care of Seme's older brother. I think you would still have an obsessive mindset but I don't think in a non-monstrous world that he would ever Force his older brother to do anything.