beta
Both Ian and Noah are at fault for not being clear about their expectations.
Noah wasn't the only person who was violated in this chapter. Ian is at home alone and has no self awareness, no ability to consent. No ability to control his actions. You sleep with a drunk person that's assault. Ian isn't falling down drunk but it's the same principle.
Noah assumed he would be fine because he's a beta but you shouldn't go into someone's space when they're going through something that alters their mind. You just don't.
That's the whole point of the story, at least for me, is that this happened and it happened to both of them. Rather staying to explain, Noah took off. Could you imagine, waking up, clearly having had sex but no idea how or with who?
Neither one of them is "right". They've both done pain and damage and the story is to overcome that.