The AV I watched this time features Maihara Sei playing a beautiful mom who disciplines her daughter's boyfriend with Spartan education. Sei's acting skills are impressive, showcasing her talent in roles ranging from elegant chaste wives to vulgar mature women. Especially, her technique in high-speed cowgirl position lives up to the title, with scenes of multiple creampies being extremely erotic. Sei, with her short hair and glasses, enjoys the cowgirl position with her beautiful, large buttocks, which is thrilling. The work is divided into three parts, and Sei's performance in portraying changes in feelings towards men is also remarkable. The lasciviousness of the final entanglement is a must-see. Although there were tweets about her suffering from health problems, I hope she continues to perform without stress. The glasses look might divide opinions, but the eroticism of the entanglement is top-notch. Sei's transformation from 'elegant, stern, pure' to 'grotesque, wild' is also a highlight, and the momentum of the S-woman after the impulse is irresistible. The creampie scenes with slapping sounds and the dirty talk are also incredibly sexy. This work is a shining example of Sei's superb acting, worthy of permanent collection.