21-year-old college girls and circle friends, big-titted seductresses Minami and Keiko appear! At a special cottage with ocean view, they enjoy a summer vacation drive with their senior. Today's event is a prize-winning challenge: an erotic Russian roulette where they take turns giving handjobs, and whoever makes the senior cum first loses. The senior is surprised at first—"A handjob?"—but quickly gets excited over the 100,000 yen prize and jumps in. While their friend gives a handjob, they tease with dirty talk, drool on the cock, play with nipples, and indulge in full-on female top domination. Touching the cock is allowed, and as they watch the senior's reactions, their actions grow increasingly wild. "Your cock's getting so hard," "The lube is dripping like crazy," "Do you like your nipples rough?" "Licking your anus so seriously is hilarious (lol)"—they grow more aroused, transforming into full-blown man-eaters. When the senior says, "Keiko, you're so good at this—must be because you have a boyfriend..." he erupts with a spurt! Minami wins the prize. As punishment, Keiko's aching pussy gets pounded by the male actor's huge cock. "No~ it's so squishy~" she moans, riding him in a seated position on the sofa. Minami watches jealously. The two girls then jump in together—"Let's lick it," "Let's give a titfuck," "It's harder than the senior's," "Your juices are flowing"—straddling and taking turns fucking. "That's unfair, I'm gonna stick it in too!" they cry, playing with the cock like a dildo. "It's been so long, it feels so good~" they scream, getting creampie after creampie. "This cock is amazing~" they climax over and over. "Big bro, you can still go, right?!" The two beauties (and man-eaters) keep grinding their hips in endless, relentless passion.