My sister-in-law seduces him with her irresistible body, tempting him with her stolen desires. "Just once..." she whispers, slipping into his vulnerable heart. As their unfaithful relationship spirals out of control, they can't help but forget their morals and their marriages, consumed by the forbidden pleasure of being together. Each time they share this secret affair, they drown deeper into the pool of lust, unable to resist each other despite knowing that it could destroy everything. "If only I had known... my brother's wife was this horny," he thinks, lost in the heat of the moment. *Note: Content may vary depending on recording method.

義姉が仕掛けて迫るヤリモク肉体関係。「ちょっと一回だけ…。」と、魔が差した男の心の隙間に入り込むオンナの略奪心。ダムが決壊する様に倫理観は崩壊して不貞の沼から抜け出せず、妻を忘れ…我を忘れ…寝取られる…。決して身内にバレてはイケない肉体関係を重ねるたび、禁断の快楽に溺れてしまう2人。「知らなければ良かった…妻の姉がこんなにスケベだったなんて…。」※ 配信方法によって収録内容が異なる場合があります。