Once was Not Enough, Iwai's Descent

Reiko Iwai, a mature woman, believes she can control her desires, suggesting a one-time encounter with her stepson. However, his youthful virility and her hidden longings lead her into an intense, prolonged session of taboo sex. She resists, but his relentless passion and her own growing arousal push her deeper into the forbidden, culminating in multiple orgasms and a newfound addiction.

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