Young wife Miho had been living a peaceful and comfortable married life until one day she accidentally came across her husband's junior colleague staying overnight at their home—and caught him with a full morning erection. The shock was overwhelming, deeply shaking Miho to her core. Never before had she seen such a large penis, and instantly her mind was consumed by it. Her lower body began to ache with desire, gradually transforming into a body that could no longer be satisfied so easily. That intense shock and arousal left a profound mark on her heart.