Slavery: A series of erotic games (book 04)
He was pounding me pretty fair.
"Excuse me, Mister Thornhill," Shasta said, right next to me, "I was wondering if I might ask a favor of you?"
"What do you need, Shasta?"
"Not money," she laughed, "but I've recently started having sex with men again thanks to my slave, but several of my friends, including the little slut sucking your dick, say being triple penetrated is a very enjoyable experience for a woman. I only have the one slave myself, so would need a couple other cocks to complete the experience for me. I was hoping for one of them to be yours."