Yui's undeveloped erogenous zone—her nipples—is thoroughly awakened using a specialized nipple toy. Stimulating her nipples brings her to her very first nipple orgasm. Continuous nipple play combined with clitoral teasing and fingering pushes her into repeated erotic climaxes. Even during blowjob scenes, her nipples are relentlessly teased, making her writhe and suck passionately. When her nipples are stimulated by the penis, she reaches orgasm through her nipples while simultaneously climaxing in her pussy. Fully obsessed with nipple ecstasy, Yui's soaked slit is penetrated, and as her nipples are stimulated, she experiences simultaneous orgasms in both her nipples and her pussy.