He asks for help

“Or... you could give me a hand..” Frank muses.

Diane is shocked that he would even joke about that. “Not. Funny.”

“I wasn’t joking.”

Diane glances back, only to see Frank’s already got his dick out. She knows she shouldn’t, but she can’t help but stare. After a moment of thinking, and looking back to make sure their friends aren’t paying attention, she reaches out, gripping his cock. She slowly strokes it for him, while he leans back on his hands, a grin on his face.

Frank had really put it all on the line, but it had payed off for him. He enjoyed her soft hands pumping his shaft for a minute, before eventually cumming.

“Ew..” Diane grumbles, wiping the cum off her hand into the sand, before standing up. “Now. Lets go.”