一つ屋根の下、優等生の義妹・なみに抱く抑えきれない情欲。不眠に悩む彼女に睡眠薬を手渡した瞬間、背徳の睡眠姦の幕が上がる――。ベッドに横たわり、深い眠りに落ちた未成熟で無防備な身体。制服を静かに剥ぎ取り、抵抗できない彼女の唇を奪う強引なディープキス。無防備なピンクの乳首を舐めしゃぶり、完全無垢なワレメへ顔を埋める濃厚クンニ。全身にマーキングするような執拗な密着愛撫。ぐったりと眠る彼女の衣服を弄び、その姿を写真に記録しながら、意識のないワレメへ容赦なく突き刺す生ハメピストン。眠ったままの彼女の奥深くへ、ドロっとした熱い精液を注ぎ込む中出しの愉悦。朦朧とした半覚醒のなみを相手にバレないで欲しい気持ちとバレていっそ俺のモノにしたい気持ちが入り混じる。射精するためだけの自己中なピストンでも腰を震わせ、甘い喘ぎ声を漏らして絶頂へ…。

Living under the same roof, he harbors an uncontrollable lust for his honor student stepsister, Nami. The moment he hands her a sleeping pill to alleviate her insomnia, the curtain rises on a depraved act of **** while she sleeps. Lying on the bed, her immature and defenseless body falls into a deep sleep. He quietly strips off her uniform and forcefully kisses her lips, which are unable to resist. He licks and sucks her defenseless pink nipples and buries his face in her innocent cunt for a passionate cunnilingus. He persistently caresses her all over, as if marking her body. He plays with her clothes as she sleeps exhausted, taking pictures of her, and mercilessly thrusts his bare penis into her unconscious cunt. He pours his thick, hot semen deep inside her as she sleeps, experiencing the pleasure of ejaculating inside her. With Nami half-awake and drowsy, he is torn between wanting to be found out and wanting her to be his. Even with selfish thrusts aimed solely at ejaculation, her hips tremble, and she lets out sweet moans as she reaches orgasm…