Wife's Sister

My wife and her sister are both very attractive. Every time we get together, I can't seem to get her sister out of my head in a naughty way! She comes over with her family and visits, but she always tries to be the mothering type. She gets on my nerves because we are both stubborn. I think I get on hers, too. But I still imagine giving it to her hard like you wouldn't believe. I think this would show her who is more dominant. I even have dreams of her when she is here, and I wake up with the hardest erection possible. I'm getting excited just thinking about it!

— Stephan, 29