Teenage stepson Jun can't take his eyes off his stepmother Yurina's big tits, enduring each day in agonizing desire. Taking advantage of his father's late returns, he secretly peeks at Yurina while she bathes. Mesmerized, Jun watches breathlessly as she suddenly sighs, gazing into the distance. In that instant, she slowly begins groping her own swollen breasts and lewdly fondling her crotch. Overcome with shock and arousal, Jun gasps aloud and panics, trying to flee back to his room—but Yurina notices, captures him, and won't let go.