Write an intensely erotic, taboo tale featuring two twin sisters, both with distinct perspectives. One of them is a futanari, possessing a penis-like appendage, and is known for her expertise in knotting pussies. The story unfolds amidst a drunken escapade, where the sisters make a risqué deal at a bar, unbeknownst to their friends chatting nearby.

The futanari sister, in a fit of intoxication, agrees to pay her prostitute sister for a night of vaginal intercourse. The terms? No kissing and strictly emotionless sex. Eager to satisfy her sister's desires, the prostitute sister obliges.

As their friends remain oblivious, the prostitute sister climbs onto her futanari sister's lap, lowering her skirt to reveal a lacy thong. She expertly positions herself, exposing her sister's knotting appendage. The futanari thrusts deep into her sister's pussy, causing the knot to tighten and render escape impossible. The futanari then proceeds to fill her sister's pussy with her seed.

While still knotted together, the futanari, now desperate to urinate, whispers her predicament to her sister. Reluctantly, the sister agrees to let her futanari sister pee inside her pussy as she masturbates, their arousal simmering down to a subtle realization - they've just engaged in forbidden, incestuous acts.