Mizukani (Circle)

There is a girl in this world that cannot awaken until she reaches orgasm. Fumina has a problem. That is... orgasmic in nature. Specifically, that she cannot wake up in the morning without coming to climax. Supporting her, the gracious and loving Yukii. Using her expert technique, she brings Fumina to climax in the morning, and saves her from being late. However, Fumina doesn't get sleepy in just her bedroom. The embrace of slumber so sweet, she falls to its charm at school, and even outdoors...! Can Yukii continue to successfully wake Fumina with her skillful touch!? (Source: DLsite)