Hajime, an adult baseball-club player permanently stuck on the bench, is constantly targeted by his two adult childhood friends, cheerleader sisters Rio and Jun, who fight over sucking his cock. They introduce a new rule: neither sister switches until she makes him cum. From then on, one slowly works him to ejaculation before they trade places, trapping him in an endless cycle of alternating blowjobs and unwanted orgasms that keeps him from practicing.