The ML is just as bad as his brother when you think about it. He forced sex on her and kept her imprisoned even after she found out who he really was. The sex before that couldn't count as consented to because she really thought it was a different person.
The ending feels like it came out of no where. Really disappointed I've cried while reading chainsaw man so I know you could have done better. I really hope this isn't truly the end because if it is then that's too bad.