Okay and? Thats like saying Suryeon didn't rape him in the beginning because she "paid" for it. Yall are so fucking weird. Just because his body reacted doesn't mean what happen was wrong even if he comes to like Rosa play later on. Especially when he fucking verbally said NO. Like excuse him thats hes scared ti suffer the consequences from both women.
Yes it can happen (I do agree with what you said about Rosa) but it doesn't excuse how i happen or the behavior to spark such relationship. Yeonwu currently doesn't how to differentiate between it and is confused about the whole situation especially his overall feelings of it. There's a reason he still said no and to stop in the beginning.

ion think he wants that, he's just thinking that way because he's confused, and that's just how he's living