Since they're both women, their weak points are obvious in this love affair of nipple teasing. In the first round, Mion teases Yuri's sensitive nipples, pinching and teasing them when they become hard, causing her to squirt and reach orgasm. Then they switch roles, and this time Yuri starts teasing Mion's nipples, which she responds with a sharp reaction. As they do titty nine and rub their nipples together, Mion's nipples get harder and harder, and she ascends to heaven with her first ever nipple orgasm.