「お口で我慢して。その代わり好きに動いていいよ」お口ま○こに高速ピストン！姉の顔に大量顔射で大興奮！父子家庭のボクには歳の離れた美人の姉が…

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Living in a single-parent, father-son household, the protagonist’s only female presence is his much older, beautiful sister (Koharu Suzuki). Driven by his growing urges, the dynamic shifts when his sister makes a submissive proposal: "Just use my mouth." She encourages him to move as aggressively as he wants, leading to a series of intense, high-speed oral sessions where she is treated as a living sex toy. The film focuses on her total submission, culminating in multiple heavy facial finishes as the boundaries of their "father-son home" are completely demolished.