Mio lives happily with her cousin Ayato, who's like an older brother to her. But she's been having weird dreams lately... "erotic dreams" have been troubling her. Every night, some tentacle-like being probes and teases her most intimate places. And it grows more and more intense. When Mio climaxes and wakes from the dream, her beloved Ayato is there by her side. But for some reason, being near him fills her with fear. After his secret is exposed, Ayato is unbothered, confines her, and begins her pleasure training in order to claim both her body and her heart. He uses toys, his fingers, and his tongue to relentlessly torment her clitoris. Then, the blood sucking begins-her hips rise over and over again from the pleasure, her mind melting into pure ecstasy, until... "Whatever you want... your cousin, lover, family... I can be anything for you."