On a dating site, I met Yuuya, a pretty boy who looks just like a rider actor! Though he usually has an S personality, I subject him to various forms of training using every method possible. Through masturbation shows, blindfolds, bondage, vibrators, and electric stimulators, I gradually draw out his hidden side. Taking on the role of his older sister, I guide him through his first experiences, and slowly his latent masochism begins to awaken—eventually, he becomes aroused simply from caressing me. An exhilarating transformation unfolds as his desires evolve.