Betty begins to rub her hand over your cock.
From Create Your Own Story
Beneath the surface of the water, masked by the bubbles of the hot tub, Betty's hand brushes over the front of your swimming trunks. Your cock is still thick and hard from the sight of the girls changing, and you settled down into the water between Betty and Veronica, and arm over each girls' shoulders as you relax and enjoy the sensation.
Betty presses her palm against the underside of your shaft, rubbing firmly up and down the length through the fabric of your swimming trunks and you find you have to clear your throat just to keep from moaning. Veronica turns toward you and smiles, oblivious to what Betty is doing just inches away from her. "So what do you think of my hot tub?" Veronica asks, seeming quite pleased with herself.
You stammer for a moment as you try to answer, thoroughly distracted by the slow, firm motion of Betty's palm moving up and down your cock.