Okayyy, so I know I ask a lot about this subject, but I have this m/m romance subplot where one character is a serious psychopath, with a history of actively being ruthless in a lethal sense. He's a real arsehole. But then, the character Sebastian comes along. Originally, he's just someone to be manipulated because of his use in the circumstances. But then, after Bradford, the psychopath, initiates sexual relations, Bradford begins to develop true caring feelings for Sebastian, even falling for him after a time. This is a startling change for him, as the only person he ever loved or cared about emotionally was his mother, who betrayed him. Bradford goes through some conflicted character stuff where he actually does thing out of concern for Sebastian, and feels guilt for the first time as opposed to just logic-based regret (gasp). He proposes to Sebastian and he accepts. Just afterwards, it becomes revealed to Sebastian what sort of person Bradford is and was. This makes things pretty weird. My idea is that after that Sebastian is more hesitant and way more suspicious of Bradford(Chris to him, Bradford is his surname) but can't help still loving him. Bradford in return continues to experiment with morality, and maybe ends up sacrificing himself for Sebastian? How would you advise I depict Bradford's character development and the change in the relationship? Those points are the most important interest areas so I want them to be realistic and effective character journeys.