Yuu Kawakami, the nymphomaniac girlfriend, repeatedly grinds her wet pussy against her boyfriend's body, marking him as her territory. She rides him in the cowgirl position, vigorously rubbing their lower bodies together and thrusting in every direction—up and down, back and forth, side to side—twisting her hips in a full 360-degree motion to intensely stimulate his cock. As her relentless movements shake his penis, the extreme stimulation accelerates sperm production, leading to an incredibly erotic creampie scene.