Create an erotic narrative that is both tantalizing and taboo from the perspective of a futanari mother. She is on a crowded train with her daughter. 
They are pushed together and as they tried to move around they are forced to have sex because of the crowd. The story should evoke a sense of illicit pleasure and arousal, and make the reader feel like a voyeur peeking into the intimate lives of these characters. Be descriptive and use sensory language to make the experience as vivid and enticing as possible. Making sure to add dialogue