Me and my gf at the time had a huge exhibitionism and showing off kink. One day we wanted to do something risky and public. We hopped on a train in our hometown and agreed on a plan. I would go into the toilet, undress myself entirely and give all my clothes to my gf. She would then go thru the train and bring me back my clothes shortly after. I did exactly what she ordered me to do and handed her all of my clothing while having the boner of my life. My gf had a slightly different idea though and changed the plan spontaneously. When the train stopped at a train station i received a FaceTime call from her where she fucking left the train! I was shocked as i watched her going up and down the station until the train drove off again. There i was, naked in a train toilet with no chance of having my clothes back anytime soon. I asked her what she thinks is going to happen now. She told me to wait until the last station (which was only 10 minutes away), stay in the train until it leaves again and meet her at the same station she just left. That meant i would have to spend at least 20 minutes naked until i would be able to get dressed again. I started to argue with her but realised there is no other option since my clothes are in her backpack far away. And so i waited for the entire time, nervous what would happen if somebody tries to enter the toilet. I was still rock hard and my gf ordered me to cum until she enters again, otherwise i wouldn’t get my clothes back for even longer. So i started to jerk off and managed to cum before arriving at the train station. My gf knocked on the door, i let her in and she finally gave me back my clothes. This was one of the most thrilling things i have ever done.

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