Tupping Tamara (And John‪)‬

An adult story, not for sale to under-18s; do not buy if you may be offended by graphic descriptions of straight and gay sex, and hard violence inflicted on a man's naked body.

Tamara claims she doesn't want any man apart from John; then they find themselves sharing a table with six men in a pub and she realizes she does! She takes one outside for a quick one, and then all eight of them go back to her flat.
But the men don't just want her: they also go with men, and before long John is on the receiving end of some hard action.

Then later, egged on by Tamara, one of the men shows off to his mates by beating John up, giving his body, and especially his genitals, a brutal kicking.