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I continued fingering her while stealing glances at the diver. He was still there, watching us intently. Sarah moaned as I hit the right spot, and I could feel her getting close to orgasm. But every time she was about to cum, I stopped, teasing her. "You can't cum yet, baby," I whispered into her ear. "I want you to hold it in for a little bit longer." Sarah was getting frustrated with me. "Please, John," she begged. "I need to cum. Don't tease me like this." I smiled mischievously. "But it's so much fun," I said. "Besides, the diver is watching us. I want to give him a good show." Sarah's eyes widened in surprise, but then she grinned. "I don't care who's watching," she said. "I just want to cum." I could feel her getting closer and closer, her breaths becoming shorter and more ragged. But just as she was about to tip over the edge, I stopped again. "John, please!" she cried out in frustration. I chuckled. "Okay, okay. I'll let you cum," I said. "But first, I want to hear you say that you're a dirty little slut who loves getting fingered in front of strangers." Sarah looked at me with a mixture of embarrassment and excitement. "I'm a dirty little slut who loves getting fingered in front of strangers," she said, her voice barely above a whisper. "That's my girl," I said, grinning. I resumed fingering her, and this time I stopped again.

As Sarah's frustration grew, I could feel myself getting more aroused. There was something about her **** need for release that drove me wild. And then, the idea that we were being watched by a stranger added a whole new level of excitement. I couldn't help but feel a rush of adrenaline as I imagined the possibilities. But as Sarah continued to beg for release, I could feel myself losing control. I wanted to give her what she wanted, but at the same time, I wanted to tease her just a little bit longer. I wanted to make her wait for it, to make her crave it even more. So, I continued to finger her, drawing out her pleasure and driving her to the brink of orgasm over and over again. Finally, I could see the frustration in her eyes turning to anger. She'd had enough, and she was not afraid to let me know it. "The only thing I care about at the moment is that I get to cum," she said, her voice dripping with frustration. "If you are embarrassed then go back to the shore. I'll continue on my own, or better yet, maybe he'll help me get off."

I couldn't believe what Sarah just said. My cock hardened at the thought of her getting off in front of a stranger, and the idea of him helping her only made it harder. I felt a rush of excitement and jealousy at the same time. I couldn't let her have that, not without me being involved. I moved my hand faster, my fingers delving deeper into her pussy. She moaned loudly, her body arching towards me. The diver was still there, watching us, but I didn't care anymore. All I wanted was to make Sarah cum and claim her as mine. "You're mine, Sarah. No one else is going to touch you. Not him, not anyone else. You belong to me." I growled in her ear. Sarah's eyes widened with pleasure, and I could see the hunger in her gaze. She wanted me, and I wanted her. I felt a sense of power and control over her, and it turned me on even more. I slipped my other hand around her waist, holding her tight against me as I continued to finger her. She was so wet, so hot, and it was driving me insane. I wanted to fuck her right there in the water, in front of the diver and anyone else who might be watching. But I also wanted to teach her a lesson. I wanted her to scream my name, to know that she was mine and mine alone. I moved my fingers faster, my thumb rubbing her clit in tight circles. She was close, so close, and I knew it.