Write a long form taboo erotica about two twin sisters. One is a futanari  with a dog shaped dick. She pays her prostitute sister to have sex. She 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 Your response should contain 1000+ words.
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