A private anal expansion training video featuring Airi Sato undergoing female body modification. She has transformed her body in pursuit of feminine allure, treating her anus as a vaginal cavity—expanding and stimulating it until the composed Airi ignites as a passionate female masochist. Mounting in cowgirl position, her anus softly stretches open, easily swallowing a long dildo. As she takes it fully inside, grinding her hips while jerking off the cock, her body trembles in ecstasy, convulsing violently again and again. After these intense reactions, Airi squirts. Then, changing into a revealing high-cut swimsuit, she receives her master's cock, offering a blissful blowjob with a euphoric expression. Further aroused, a vibrator is thrust into her excited anal pussy as she performs tearful service. Receiving her master's cock, she climaxes in satisfied masochistic pleasure. The semen deposited in her anus is sucked out by her master and returned to Airi's mouth, which she obediently drinks entirely—demonstrating her absolute devotion. Still under the intense afterglow of anal sex, Airi pleads to urinate in the bondage room. With her cock still erect beneath her swimsuit, she proceeds to leak a large amount of urine in front of the camera.