Huck is, hands down, the best erotica writer I know of. His kinks are not my kinks. His stories feature humiliation, dubious consent, and some nasty characters. But, jesus, can he ever write. You can't look away, even if you want to. Check out his stories. If you dare.
I'll be posting my own answers to the same questions in a few days, along with some links to other erotica writers that I like, so check back for that.