Five best friends challenge each other in the 'early cum no.1 battle! who has the most erotic hip movements?' pounding reverse cowgirl, continuous internal ejaculation battle! with each ejaculation, the prize money increases, and they grind their hips wildly in front of their best friends, milking out the sperm! seeing their best friends' sex for the first time, their sensitivity skyrockets! an orgy battle of fucking, cumming, and pulling out!