In the Straights

My wife got drunk at a vacation house we rented with a bunch of friends and cheated on me with my best friend in the hot tub. They didn’t have sex but they did other things. I wasn’t there but there were eight other people in the hot tub and the jets were on so no one else saw what was going on “under the water.” My wife told me about it afterward and I was hurt but also kind of excited. She proposed we “even the score” by asking my friend and his wife to have a foursome. They agreed but the experience was miserable. My wife and my friend were very into each other and my friend’s wife was willing but I was having a hard time enjoying myself with a woman I had no interest in while my wife did things for my best friend that she would...