I had suspected my wife and her brother-in-law (her sister's husband) were fooling around beyond the constant teasing that I noticed when they visited with us. During one visit, I had gotten up early one morning to meet some friends for coffee while everyone else was sleeping. I came back home after about an hour, whereas I usually am with them for a couple of hours. I heard the shower upstairs and assumed my wife was up. I went upstairs with a plan to maybe surprise her and hop in the shower with her. As I was quietly climbing the stairs, I heard my brother-in-law's voice say, "Can you bring me a towel?" As I reached the top of the stairs, there was my wife in the short t shirt and panties she slept in and the bathroom door open, handing my brother-in-law a towel. He had the shower curtain open and was naked and in plain view. My wife turned around, startled, and the shower curtain and door closed quickly. I said, "What the hell was that?" She looked sheepish, and said, "Melinda (her sister) was still asleep and he had hollered for a towel; I didn't know he'd have the shower curtain open." I let it go because it turned me on so much, but I decided to look for more "signs" during their visit.
— Grant, 34