Her voice

You stare at her avidly as she rests in the water, but your eyes widen when her hands start stroking her body. Luckily, you were smart enough to install a camera with a microphone embedded so you could hear what went on as well.

"Damn, Debbie, you're a naughty girl." You hear as her hands begin caressing her breasts. "Never knew you had the exhibitionist streak in you. Wish there was a camera in here..." She moans loudly as one of her hands trails down between her thighs. "I bet if I called that guy back he'd install another private system, so I can show off to myself and Simon without anyone knowing..." She gasps as she thrusts her fingers into herself. "Dirty man would probably put in a line for himself to watch, too." She begins to moan as she finger fucks herself.