Press yourself up against the wall of the pool.

You push Gemma right against the wall of the pool, the back of her head striking it with a thud, and wrap your legs around her, obscuring as much of her as possible. Unable to move, she expertly works you with her throat muscles, pulsing around the head of your cock.

"Wasn't Gemma in here?" asks Rebecca, confused.

The water ripples as her foot dips into the pool, testing the temperature. You glance up, your heart pounding, as her toes skim the surface just a few feet away. Gemma is oblivious to what's going on above her. Her fingers dig into your thighs, her nails biting into your skin as she takes you to the back of her throat again and again. The water muffles her gags, but you can feel the vibrations of her moans against your cock.

"Mmm... a bit too cold for me," says Rebecca, her foot finally leaving the water. She returns to her chair, the magazine rustling as she flips a page.

You look down at Gemma. Her lungs must be burning. You can see the strain in her face, the way her chest heaves with the need for air. But she doesn’t pull away. Gemma’s eyes are wide, her cheeks hollow as she sucks you harder, her throat massaging you with every movement. She’s drowning in you, and the thought sends you over the edge. You cum with a groan, the sound lost in the water as you spill down her throat, her body shuddering. The moment you’re done, you pull out, but Gemma doesn’t surface. She stays underwater, her hands slipping from your thighs as her body goes limp, her lungs finally betraying her.

You reach down, grabbing her by the arms and hauling her to the surface. She breaks through the water with a gasp, her chest heaving as she drags in a deep breath, her eyes wide with shock and exhilaration. Water spills from her lips, her body trembling as she clings to you, her nails digging into your skin.

Rebecca clears her throat. “Everything okay over there?”

"Y-yes," says Gemma, her voice raw. "I was just seeing how long I could hold my breath for."

Rebecca cocks an eyebrow with a bemused look and goes back to her magazine, none the wiser - but the danger lingers, thick and electric in the air.