Write a long form taboo erotica about two twin sisters. One is  a dog shaped dick futanari. The futanari pays her prostitute sister to have sex. She agrees and says no kissing or touching anything other then my pussy. The futanari Knots her sisters pussy and can't pull out. After sex with her sister while she is still knotted with her sister she has to pee. The sister reluctantly let's her futanari sister pee inside her while she masturbates