I went up first, deliberately taking the lead so that they could all look at me from behind. I was doing more now than just entering into Paul's game, I was actually encouraging it.

When I got to our bedroom I was in for another surprise. Our bed had been stripped of duvet and pillows so that it was just a flat platform, ready for sex. Now I suddenly understood why Paul had been upstairs when I first arrived home. He'd obviously already decided to share me with his friends and had got things ready in advance. I don't know if either of them quite understood the implication of Paul's...