Write a long form taboo erotica about two twin sisters. One is a futanari endowed with a dog shaped dick. The futanari pays her prostitute sister to have sex no kissing touching or emotion. The futanari Knotts her sister 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