OK, to be clear, I disagree with your diagnosis that the woman is a psychopath.
If my 16 year old had regular sex with a 25 year old, attractive, and willing teacher, I wouldn’t be outraged and wouldn’t think he was raped or somehow damaged by the experience.
Lots of young men have early sexual experiences with older, willing women. There’s no reason for outrage.
But don't bother. If you don't understand what's wrong with this particular situation, I'm not really interested in your opinion anyway.