"Don't worry about it, Gary. Just get yours."

Gary slowed his thrusts and squeezed his best friend's butt cheeks. "Pete," he said. "How we gonna get you off?"

Peter laughed and looked over his shoulder. "Don't worry about it, Gary. Just get yours," he said.

Gary's cock swelled inside Peter's ass. "Fuck."

"I feel you," Peter said. "C'mon, just shoot me, you fucker." He grinned and turned his head back forward.

Gary's cock swelled again. He gripped tight to Peter's buttocks. "Fuck, you asshole."

Peter braced himself against the armchair and started thrusting back at Gary. Gary dug his toes into the carpet and held on tight, letting Peter drive.

"That. Doing it?" Peter asked, his breath coming out in quick pants as he fucked back at Gary.

"Fuck yes, Pete," Gary said. His cock pulsed and a shiver ran through him.

"I liked. Your hand. On my balls. You want that?" Peter said, thrusting back at Gary.

Minutes ago, Peter's balls, gripped tight in Gary's hand as Peter thrust deep inside Gary's dad and shot his load.

"Yeah," Gary said. "Yeah Pete, someone grab my balls!"

Someone stepped up behind Gary and cupped his balls in a warm hand. Squeezed. That did it.

Gary dug his fingers into Peter's buttocks. His hips bucked, thrusting deep inside his best friend's ass, and he cried out loud as he came. Peter moaned loudly with Gary's hard, deep thrusts.

Their watching audience cheered, welcoming Gary as he finally showed them what had been hidden. Their parents and girlfriends raised their voices while Bryan and Kate from the cruise watched quietly.

The helping hand opened, giving Gary's balls a gentle caress before withdrawing. Gary turned his head around. "Th-thanks," he said.

Suggestions or votes welcome in the comments. My list of likely helping hands is: Sally (Peter's mom), Jim (Peter's dad), Bernie (Gary's girlfriend), Joyce (Bernie's mom), Sandy (Peter's girlfriend, who saw Gary/Peter once before).