New massage therapist Miki experiences her first anal pleasure under the guidance of veteran instructor Ko Asumi, who teaches her the secrets of anal stimulation. Overwhelmed by the sensation, Miki quickly reveals her natural talent. During her first client session, she uses her drill-like tongue to lick and probe the customer's anus while delivering an expert handjob that drives him to the brink of ecstasy. The interplay of big ass massage and mutual anal stimulation deepens the bond between the two women. Then, in her first anal sex scene, Miki exclaims, "Incredible! I'm coming through my ass!" as she experiences multiple intense orgasms from anal penetration. A passionate, pleasure-filled story showcasing Miki's transformation and the intimate connection she forms with her client.