Years ago, Reona Kasai was the convenient fuck buddy who came whenever I called. Once I got bored, I dumped her and began dating her best friend Ryoko. More than two years later, I meet Reona again at a group dinner and find that she has become stunningly beautiful. When my girlfriend leaves for three days, I call my former lover over. With this submissive partner I indulge in everything I hold back from doing with my girlfriend—choking, spanking, bondage, and forceful deep-throat—using her without restraint throughout the entire three-day affair.