トレーナーのセクハラレッスンに「私は人妻です！」と抵抗するが、マッスルピストンに今まで味わった事のない絶頂を体験！特にバックピストンが強烈で、子宮をエグられるような快感に汗も潮も吹いて痙攣アクメ！旦那では1度もイケなかった美尻妻が何度もイキ狂って、旦那以外の精液（プロテイン）を膣奥に注がれて理性崩壊！快楽に溺れたなつは、不安に思う旦那をよそに今日も寝取られにジムに通う。
She resists the trainer’s sexual harassment, shouting, “I’m a married woman!” but his powerful thrusts send her into an orgasm unlike anything she’s ever experienced! His thrusts from behind are especially intense, and the pleasure feels like her womb is being torn apart—she sweats, squirts, and convulses in ecstasy! This wife with a gorgeous ass, who’s never once been able to climax with her husband, goes wild with multiple orgasms. As he pours his “protein” deep into her, she loses all sense of reason! Drowning in pleasure, Natsu ignores her worried husband and heads to the gym again today to be taken by another man.

– JavGG.net