In the sultry summer heat, sister and brother find themselves alone at the pool. She teases him mercilessly in her skimpy swimsuit, knowing full well what she's doing. He tries to resist, but her provocative display of flesh and the sight of her toned body glistening with sweat prove too much. As she lounges on the float, one hand dips beneath the water, fingers finding her throbbing clit. He can't help but watch, his cock hardening in his shorts. She catches him staring, a wicked smile playing on her lips. "Like what you see, big brother?" she taunts. He can't take it anymore, lunging at her, ready to claim her right there in the sun.