Romeru
I think this is taking a better path than I thought it would. Riley knows what he is; a monster who finds pleasure in the suffering of others, but he has things important to him like all men, even those who have blood on their hands. Reading this I sometimes think that Riley may be more mature than he appears and that gives a plus of freshness to the novel. I prefer a thousand times this than those MCs according to demonic that are fashionable nowadays (Fang Yuan type). I hope you don't introduce things like pregnancy and that now... I say it because someone mentioned it in the comments and I don't want you to get the bad idea, at the rate you're going, you're doing well.