Twister
Janie and David had been together for many years, since a fling turned serious. They kept it exciting by, well, fucking a lot basically, with whatever twists they could think of and organise. A favourite type of 'Treat Sex' was when Janie's other lover Chris came to stay, and the three of them could get off in combination. Fantasising about other expansions on the basic couple was another regular turbo boost to a sex session: "What about if X were here, how would we set about seducing...