We were visiting her sisters house. She uses the hallways bathroom that we have to share to shower. My wife had run down to the store right after he sister hopped in the shower. I walked back to the bedroom, but as I passed it realized it was cracked a few inches. I couldn’t help myself and tried to look. I could see right through the glass door. I couldn’t help but take my cock out and start rubbing since no one else was home. I got greedy and opened the door and little more and she saw me. We both started at each other in shock for a few seconds, with me cock in hand. She finally smiled and then winked and went back to showering. I kept rubbing and she just watched and smiled. Finally i came and she just gave me a wink. I want it to happen again so bad, but feel guilty about it!
