The fourth installment of the series features Rubi Aiba! Once again, guidance is provided by Teacher Yamabuki. With her loli-like figure, she demonstrates expert soapland techniques—not only pleasuring customers but turning the tables, dominating and relentlessly teasing her partner. Dressed in sheer sailor uniforms and frilly babydolls, she enthusiastically sucks and thrusts with wild energy. Watching her skillfully control her man like a playful game highlights the irresistible contrast between her cute, girlish face and her bold, experienced moves. Packed with exciting scenes, this one delivers non-stop thrills.