While my wife was away, her friend came to visit. I told her my wife was out, but she said, "Won't you talk to me for a bit?" so I let her in, and she started complaining about her husband and her sexless marriage, which was a little confusing. Then she asked me, "How about your house?" so I tried to brush it off vaguely, but she kept asking me about nighttime activities. And then we gradually became more and more erotic...