I have a 42 year old niece and single. Don't know how much dick she gets.

She has no idea that I do in fact fantasize having sex with her. She has a lovely *** and I bet she would be fantastic in bed , would please a man to no end.

I know it would never happen, but my fantasy lives on.

Sometimes

That's incest and depending in her age also possibly illegal. Not to mention morally repugnant.

the question is do they want to ? not that they do it.

Probably not.