A special project orchestrated by Koki Takeki unfolds to fulfill the desires of clients seeking sexual relations with blood relatives. Responding to a request from a brother wanting an intimate encounter with his twin sister, the story begins at a massage parlor. The sister, arriving as a reader model, is told the session is for beauty purposes and submits to lewd massage treatment. Secretion flowing heavily, she is overwhelmed by pleasure as she's blindfolded, penetrated by a cock, and has her clit stimulated until writhing in ecstasy. Midway, the brother takes over, and without losing consciousness, she writhes once more in overwhelming pleasure. One week later, the sister returns, actively seeking another obscene session. Eagerly stimulating the masseur's cock, she is blindfolded again and fucked by her brother, swept once more into a whirlpool of pleasure.