Huh? I don't know if you noticed but this is a story with a clear taboo relationship between them, that's why Erik resists so freaking hard even though it's clearly stated multiple times that he has feelings for her too. (And it'll be much clear in 1.5)
And I don't see this abuse you talk about, it's just a slow build up between two already very close individuals, one which keeps denying his true feelings so the other is forced to take the initiative.
Also I don't get why you are shocked by some mild stuff? Seriously, that night scene is kinda tame compared to the many AVNs where the male MC is just an extremely unhinged pervert who does way worse things from the very start, so I don't t get this double standard of it being okay when a male does it but not a woman.