I'm finally telling this true story that happened a few years ago.
Every summer my wife and I stay at a cabin with three other couples for a four day weekend. The group consists of us, my wife's brother and his wife Suzy, Suzy's sister and her husband, and a couple that's unrelated to us. The cabin is owned by Suzy's sister and her husband. The cabin is on a beautiful lake with a sandy beach and warm mid-western sunshine. It's always so much fun to get away and relax, not having to deal with daily life. The cabin has only two bedrooms so two couples stay in the cabin, one in the bunk house, and we stay in a camper. Besides two bedrooms the cabin has a kitchen, living room, and one bathroom.
My sister-in-law Suzy is one of the hottest women I've ever met. She's blond with a perfect body, big blue bright eyes, great smile, and very friendly. We've always had some kind of secret crush on each other and seem to have a special connection on our view of things. Suzy is always flirty with me and has some exhibitionist tendencies too. Her husband and my wife are brother and sister so we've never been more than good friends with a little connection.
We all arrived at the cabin on Thursday afternoon. Our routine usually involved grilling, goofing around on the beach, some sporting stuff, fishing, and just relaxing. We all enjoyed each others company and let the day take it's course. The first two days we had a lot of fun and spent almost the whole day in swim wear. Every year I'd get so turned on watching Suzy in her bikini with oil all over her but I knew I could only look and that's it.
Since the cabin has only one bathroom there are times when someone's knocking on the door asking how long until you'll be out. On the third day I was in the bathroom taking a shower when there was a knock on the door. It was Suzy asking if she could come in to pee. Of course it was morning and we know how that is. The shower has privacy glass but it is the weakest excuse for privacy glass you could imagine. I told her that it was okay and she said "I need to go really bad." I knew she'd be able to see me but the privacy glass was a way for me to play dumb. I think she was acting on the same pretenses. I made sure while I was showering to act like it was no big deal because of the privacy glass. I purposely didn't turn my back to her and knew she was having a good show while on the toilet. I shave my privates for my wife which of course makes everything more visible. When she got up she said she wanted to brush her teeth quick and then would be out. I could see her brushing in the mirror but looking at the shower in the mirror. I did everything I could to make sure I didn't get a big hard on. I knew if that happened she'd know that I knew she could see me. I reviewed every baseball score for that week in my head to prevent that from happening.
Our day went on as usual. We all played bocce ball, drank, ate, played in the water, etc. That night we went down to the lake for our usual night stuff. We'd swim, make a fire, drink, talk, and have fun. The previous two nights us four guys went fishing as dusk set in while the girls sat on the beach drinking and talking girl talk. The boat they had was pretty small for three people let alone four. On that third night the guys wanted to go out again and I told them I'd stay back, and wished them well. The two nights before we left around 8:30 and got back around 11:00. I had nothing in mind but sitting with the girls and talking.