It's pretty obvious, you know? The simplest definition of a "happy ending" is that the main couple will have their happy ending, they'll love each other, feel safe with each other, and be fulfilled in life... So tell me, do you really think a rape victim can be happy with his rapist? I'm seriously asking...
Are you really trying to justify it like that? Rape is rape. Lack of consent. It's that simple. MC never once consented, sober, fully conscious, or without feeling he has to submit, which makes this all rape.
Besides, do you really think it's okay for someone to raise a child, beat them for years, break their mind and then fuck them? Do you really believe this is "love", because for me this is romanticization of rape and Stockholm syndrome.
I'm curious, would you be open to having sex with a child you adopted and groomed into submission through years of abuse?

rape toxic seme red flag abuse Stockholm syndrome no happy ending
Male lead is supposedly a Dom but no Dom would ever abuse anybody, especially his submissive. He abused, literally beated black and blue MC when MC was a child. A CHILD!! He been grooming MC with abuse and rape since extremely young age. There is no love, no romance, just toxicity and hate.