She, seemingly hesitantly at first, placed her hands on his chest; then as if spontaneously gaining courage, pressed firmly until he followed the momentum and laid back, looking up at her.
His body was tense beneath her, as this was an uncharacteristically physical gesture for her, but she ignored this response, and leaned forward to whisper in his ear, "Put your hands in my hair, and pretend that you love me."
Gingerly, he rose a fraction to escape the utterly vulnerable position she had placed him in, both physically, and with her words. He sought her gaze and explored the depths he saw there; the pain, longing to be held, desperation, and something else he couldn't place. Before he had the chance, she averted her eyes, and he was desperate to bring it back. He wrapped his arms tightly around her, and felt her stiffen before relaxing- almost melting into him. Taking one hand, he weaved it into her hair, combing backwards through the strands, gently forcing her to look up at him once more.
They had somehow moved such that she was now straddling him, her thin dress splayed around them, covering what was beneath- a rather impressive erection, and her crotch which was unconsciously grinding against it, sans clothing, since she hadn't bothered to replace her panties after their swim.
Placing both hands in her hair now, seemingly reassured by whatever he saw in her eyes, he gently massaged and brought her closer to his lips, so that she was almost lying on top of him, trying purposefully to ignore the need pulsing through his veins (and other areas) to strip off his jeans and push into her very naked lower half. He stopped himself not because they were at a public beach, because that had never stopped them before, but because she wanted to feel loved.
Probably without the aid of his overeager cock.