Introduction: You're about to have sex with your best friend's wife. You are Michael Foxwell, and the lady in question is Emily, who married your best friend Katie three years ago. The couple want to have children, and Emily wants to be the natural mother, to experience pregnancy, and childbirth, and the natural bond between mother and baby. Katie wants to feel that personal bond, too, and since she can't father a child herself she wants you to, because you have been her best friend since junior school, and she knows you'll be the perfect biological father. She's thrilled at the prospect, and you're happy to help. You assumed this would mean a visit to a sperm bank, but Katie is a naturalist, and insists on a natural conception.
Today's the day; Emily's ovular cycle is at the right stage for the best chance of conception apparently. You're excited; Emily may be a lesbian, and you don't like each other, but she's a beautiful woman you've always fancied. You intend to take your time and explore every inch of her beautiful body before you try to inseminate her.
Your best friend Katie has said that Emily is ready, and when Emily calls you into the bedroom you're delighted to see she's fully made-up and wearing sexy lingerie and stockings.
"Hello, Emily, I must say you look lovely".
"This is for Katie's benefit", she snaps, "not yours..."