The subtitles say "I'm not okay" and "No" as he's touching her... Is that the right translation because that is very disturbing.
Japanese porn (and my understanding of Japanese culture surrounding sex) is that women are supposed to be uncomfortable with sex, or at least say that they are. Idk. I don't know anything really, but that's what I've heard and it makes Japanese porn really uncomfortable to watch. I guess some people are into it, but I just can't be interested with the insistence that it's uncomfortable but it's being done anyway.