Mark obsesses over his slutty, teasing sister-in law.

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My wife Sarah and I hadn't had sex for 3 months.

Sarah is a beautiful woman, with long brown hair (which she usually wore up), brown eyes, high cheekbones and inviting lips. She worked out regularly and it showed. Sarah is slim, and her strength training classes had resulted in some definition in her arms. Her boobs aren't big, but they are firm as is her ass. I had always found her very attractive, although if I am honest sex with her had never been white hot.

When we met we were both 30 and ready to settle down. We got...