They leave.

"Good, now suck my cock clean!" said John stridently.

Mary sank to her knees and sucked John's cock as she squeezed her butt cheeks so as not to let the cum leak out of her butt.

After she finished, Mary, walking while clenching her butt cheeks, and John walked back to the table, where their two daughters were gripping their seats. The girls were red-faced and panting.

"What is with you two?" asked John.

"N...n...nothing," said Lisa.

"I'm....uh...OK," said Melissa.

You smile as you watch the two daughters. Maybe you should let them achieve orgasm right then and there. Or maybe run to the bathroom and beg each other to help them remove the devices. Or just leave them and enjoy your meal.