Yui, a passionate and horny swim team girl, falls for her teacher and boldly stirs the teacher's hidden desires—stealing her panties from the locker room to use during masturbation. One day, skipping practice, she seduces her teacher to the infirmary, where she unleashes a kinky lesbian encounter in her tight competitive swimsuit. With slow, sensual kisses, Yui tempts Himari into lesbian passion, her plump nipples and damp groin swelling bright red under Yui's relentless, slurping tongue. A sweet yet taboo story of forbidden desire between student and teacher unfolds.