Thinky: Consent and the meaning of sex

So, there's a fanfic author. I like this author and will faithfully read anything new she posts. Her sex scenes, to me, are blazing hot (this is part of the issue, actually).

But then there are things she writes that outright baffle me.

( discussion of consent inside, may be triggery. Also a bit TMI. )

Anybody's thoughts about this are most welcome.