Many thanks, MG. I have written stories along those lines and I'm working on three more, getting quite enthusiastic! One story concerns an idealistic young policewoman on her first day out alone, who annoys a posh woman resident by saying she can't move on a tramp who's done nothing illegal. Posh woman storms off. Tramp rapes policewoman by way of thanks.
Posh woman comes back and, having been deeply offended by policewoman's impertinence, joins in. And so on...