Frustrated by my lack of popularity, I desperately decided to summon a succubus to lose my virginity. But just as the magic circle was completed, my older sister suddenly burst into the room! From the circle emerged a succubus possessing my sister's body. I lost consciousness—and when I woke up, both the magic circle and my sister were gone. Was it all a dream...? Yet strange and mysterious events kept happening. Somehow, I gained the ability to freely control my sister's body. Using this power, I repeatedly engage in incestuous sex with her as the lustful demon returns again and again, demanding raw creampie after creampie. Each time, she drains my sperm completely, indulging endlessly. What if my sister ends up pregnant with my child...? The thought leaves me sweating.