I was in the army in a city in Germany. It was an all-male unit. One day I had to go to the medical facility across town for some annual tests. I went alone on a train. There were pretty civilian German girls riding. I was sent from one facility to another and had to ride a military bus. I sat alone at the back. Since the German driver seemed oblivious and the bus was empty, I unbuttoned my bdu pants and pulled my cock out and began to jerk off.
The driver glanced back occasionally in the rear-view mirror but could not see what I was doing because the head of the seat in front of me blocked his view. The windows were nearly one-way and mirror-finished, so no one could really see in. I pumped my enormous erection and had just passed the point of no return as the bus pulled to a stop! Four pretty teenage girls, daughters of soldiers, got on the bus coming home from school. Just as they entered I shot my load all over the riding handle on the seatback in front of me. I quickly pushed my penis in my pants and buttoned up just as the girls came straight to the back of the bus and sat right beside me. Cum dripped from the seat handle, but I think I was the only one who noticed.