Don came home unexpectedly to an unpleasant surprise. But while the guy he found in bed with his wife had no interest in taking over her support, he WAS interested in return visits, and he'd made his point with her; she would go looking for the satisfaction that Don wasn't providing her. He convinced Don that, while things would never be the same, Don stood to gain from the situation, as since his wife had cheated, the limitations they'd set upon themselves during the development of their relationship were out the window. The rules could be rewritten, and he would help write and enforce them while supporting Don. But there would need to be some adjustments made...