We start putting on sunscreen

"Hey," Susan calls out from under the beach umbrella on her beach chair. "Don't forget sunscreen." She tosses over a small bottle. Samantha catches the bottle and squeezes out a generous dollop onto Becky's open palm.

"And you, John?" Samantha asks me, offering me the sunscreen. I gratefully accept an equally-generous dollop and start to rub it onto my body.

"Don't forget to rub down there too," Becky says grinning.

"You're staring an awful lot, Becks," I retort good-naturedly. "You want to come and give me a hand?"

But I never could expect Becky to actually lean into my challenge. Still grinning, she walks over, stands right in front of me, and confidently grips my shaft with her hand! I gasp and freeze at this unexpected development.

"Why of course, John," Becky says to me in a lower voice than usual. "I'd be glad to give my good friend a hand." She gently strokes my shaft forward and back, her palm slick from the residual sunscreen. I feel my breathing quicken as short waves of pleasure shoot through me, my body frozen in place as Becky strokes my cock.

But after a few more strokes, Becky lets go. "There, that should do it," Becky says, smirking. "I hope you're not... disappointed?"

I quickly try to maintain my composure. "Not at all, Becky. Thanks for the help," I reply in what I hope is a steady voice. From under the nearby beach umbrella, Samantha and Susan are watching us with mouths agape.