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Every morning, I spend my hour-long commute on a full train. Each morning, pinned on all sides by middle-aged men, is a living hell. But that day was different. Pushed by the crowd, today. I was pinned to a female classmate. My hand was pushed into her soft butt, and I could no longer contain myself. I could not hide my excitement, and she noticed my erection poking her from behind. I was prepared to face my social death, when she told me... "It's okay. Let it out." She blamed herself for my erection, and treated me kindly. I came in her skirt and, rather than get mad at me, she began to console me! Since then, every day on that packed train, she would let me cum inside...