Create an taboo erotica about a futanari and her sister on a school bus. The bus is full and the road is bumpy. The sister is on the futanari lap. One. Bump the futanari NAME_1 slips in to her sisters panties. They are both shocked but dont want to cause a scene. The next bump the sister gets the futanari NAME_1 in her pussy. They are afraid and don't want this. They are discussed by this and start blaming each other. They try to keep a secret about whats happening. The futanari Knots her sister and can't pull out. The sister scowls not to cum in her. The futanari NAME_1 is stuck. She overfills her sisters pussy with her cum as it drips to the floor. Add dialogue