Hmm... I must admit, I’m slightly confused by all the comments myself as I don’t see anything unhealthy or illegal (at this point) in their relationship. As far as “page 3” goes, given the introductory nature of the first pages, it’s possible this was just a fantasy in his mind and not something that actually happened.
As far as Asakomis concerned, she pointed out right away that the protagonist might have been infatuated with her, and not actually in love with her. He was attracted to her physical appearance, but knew nothing about her as a human being. To that end, she shrewdly set him on a Herculean task that I don’t think she had any realistic expectation that he could, or would attempt to finish. Her goal in this, I interpreted, was to show that what he felt was not love and to get him to “move on”.
If there was to be any questionable moment, in my opinion it would have been her “decision” to publicly strip. We don’t, however, know if she would have actually followed through with it despite her “I don’t care” bravado as she was interrupted by the protagonist. It is entirely plausible that she could have been attempting to call their bluff in the hopes they would get freaked out/embarrassed and bolt. She’s teased him, yes, but she hasn’t done anything that has screamed pedophile.
I would argue that as long as things stay the way they are and she doesn’t actually get physical with him, she’s likely in the clear.