Write a long form taboo erotica about two twin sisters. One is a futanari who can knott pussy. The futanari sister pays her prostitute sister to have sex. Her sister agrees as long as there is no touching other places on her body, no kissing and it has to be emotionless sex. They agree and the prostitute sister bends over and lifts her skirt revealing a lacy thong. The futanari Knots her sister's pussy and can't pull out. The futanari over fills her sister's pussy with her seed. 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