A big dick that shouldn't be there between the legs of childhood friend Serina... "You were actually interested in this kind of Serina, weren't you...?" He was invited to his first anal sex, and before he knew it, he had ejaculated! They sucked each other's cocks, which were so hard they were sticking out of their panties, and while stroking each other's penises, the pleasure of their assholes was engraved into their bodies. Riku became addicted to perverted sex... is this a dream or reality?