In an extremely crowded commuter train, I miraculously ended up in a grinding position with a busty OL! The busty OL who looked great in her suit and I were pressed tightly together on the commuter train! I was satisfied just by peeking into her cleavage, but then I involuntarily got an erection! The sensation of her body only made it worse, my erection grew even harder, and my erect penis even penetrated her ass…and because of the train's movement, it slipped into her crotch, resulting in an unexpected grinding situation! The OL became excited from the friction between her genitals and my erect penis! Seeking more pleasure, she started moving her hips on her own, fully enjoying it, and eventually demanded penetration!
