Do you want to cum? Not yet! Trapped by the gentle older sister Akiyama Shoko, you're fitted with a chastity device and forced to endure unbearable pleasure. A reverse-kidnapping sex scenario unfolds—when he tries to masturbate on his own, he's tied to a chair and forbidden from getting erect or ejaculating. She mounts him, driving relentless piston thrusts while delivering intense blowjobs, handjob sessions, and anal torture in a barrage of diverse acts. Under the older sister's expert techniques, his climax is completely controlled until he erupts in a powerful, involuntary cumshot—then pushed beyond, squirting like a man fountain! Big sister, if you torture my cock like this, I'll flood you with endless sperm!!