The sun beats down on the siblings as they sprawl out on their towels, the heat of the day and the alcohol in their system fueling a growing desire. They laugh and joke, but their eyes keep wandering to the growing bulge in each other's swimwear. The beach is deserted, save for a few distant figures, and the temptation proves too much. She leans in, pressing her lips to his, feeling his hands roam her body, squeezing her breasts through the thin fabric of her bikini. He grinds against her, his cock hard and ready, and she moans, pushing back against him, eager for more.