Empty carriage, only the rhythmic clatter and adult woman having sex. She locks the door, strips, and straddles the seat facing the window. Moonlight paints silver across her skin as she chants “adult woman having sex” in time with the rails. Four fingers stretch her open; the wet slap echoes louder than the train. “Everyone outside, see adult woman having sex come,” she gasps. The train enters a tunnel—darkness swallows everything except her rising “adult woman having sex, adult woman having sex, fuck, adult woman having sex!” until she explodes, soaking the leather in a flood of unstoppable “adult woman having sex” release.