[crisnicht]

After swimming, about 8 years ago, my wife and hot friend took the kids into hot friend's bedroom to shower with them.
I took a quick shower in another bathroom, got dressed and sat down in the kitchen drinking a beer.

I didn't think anything of this until i noticed that the door of the bedroom was opened and I had a clear view from the kitchen.

The door was between the bathroom and the bed. I couldn't see either of them, but i could see if anyone passed from the bathroom to the bedroom.

To my surprise, a few minutes later, someone walked by, butt naked, stopped to grab something from a dresser and continued to the bedroom. I saw everything there was to see for about 5 seconds and then my brain said: "that was not my wife!"

I told them both a few weeks later over some beers. Wife just laughed. Hot friend was shy, but she seemed to like the idea that i had seen her naked.

A few months later, I wanted to keep the subject alive, so i returned the favor.
Same scenario, but instead of going to the kitchen to get a beer, i just stayed in hot friend's kid's room naked with the door just an inch opened pretending to be dressing after taking a shower.
She saw the door was not closed and just walked in to find me naked. She laughed, and apologized, but i said "it's ok. Who cares. We're like family and I have seen you naked too"

That got me into her "you-have-already-seen-me-naked" club. It has given me several benefits over the years, but I'm still waiting for skinnydipping.