Wasn't he also in a Rut? You do know heats can induce ruts right?
Yes I know, he seems to be in rut during the first time. I don't think he is a rapist at all. He is a victim too in this story. I do blame him for not coming clean when he met her again, rather than threatening her. It's simply retraumatizing her. What if she tried to take her own life during the short moment they were together ? What if the stress put so much strain on her mental state that she try to harm their child ? That is real life consequence such situation could have provoked.
Fortunately, she didn't. He mustn't have thought things through as he found them unexpectedly and he was just focused on atoning/trying to do something for them no matter what cause he blames himself(and maybe it haunts him and he's trying to cope that way) and coming clean would imply telling her what really happened(which had a bigger impact on her mental state) .He was really traumatized too, they both were and either could have tried to take their lives. I think he would've been most likely to try that especially after that first incident, he must've been blaming himself really bad while the mom tried to do her best as Rin was her reason for living even if it was hard.And I'm sure that when she came onto him the second time it must have triggered some bad memories not only for her but for him too and made them relive that trauma. They've both hurt and been hurt, and I don't think we should really be accusing anyone.
While the second time she did rape him, I'm utterly disgusted by people saying she was a rapist the first Time. The "heat" is a state where omega lose most logical thoughts, even more when it's the first Time. She wasn't sane during the first Time. How can she be liable. They were both victims.
I witnessed the story of two people deeply hurt by an accident, who took bad decisions later (threats, blackmail, leaving).
I must say that it's crazy nobody question the fact that he was a stalker in this story.