assuming she’s a prostitute he paid at the beginning of the “session”

This is a wild take though. He paid $200 to ‘release tension, whatever that was’ and was ‘hoping it goes somewhere’. She declined the $600 for a ‘happy ending’.

What he described was closer to going to a massage parlor and having them decline a happy ending, but still giving the normal massage.

Nothing about this post implies she’s a prostitute.