[Gamenhaji (Noji)] My little sister has turned into a perverted masochistic semen-sucking slut... [DL version]

When a timid sister is taken by her brother, she transforms into a masochistic, semen‑sucking slut eager for raw, visceral pleasure. Their intimate encounter escalates with aggressive oral and penetrative acts, desperate pleas, and a relentless drive toward impregnation and internal release. The story builds to a climactic, messy climax where the sister begs for mercy while the brother pushes her to the edge of ecstasy and exhaustion.