Caught by Charles

Suddenly the bathroom door opened and Charles strode in, also still naked. He looked from me stroking my cock to his wife down on all fours showing off her ass and back again. I was ready for screaming and yelling to start.

"Hey, Alan," he said casually. "Really, Sandy? Your own son-in-law?"

"You don't see him complaining," she said, motioning at the hard cock I was still squeezing.

"Fine," Charles said with a sigh. He reached over and locked the door to Kate's bedroom. "Can we trust you, Alan?"

"Sure."

"Sandy and I are bisexual," he said as his wife got to her feet and wrapped her arm around his waist. "Thats why my marriage to Marcie's mom fell apart. But Sandy was different. When we got engaged, we made a deal. We could continue to follow our urges as long as we didn't cheat. The other always has to be involved."

"And the other partner always gets to choose," Sandra said with a smile. "He picks which women we pick up-"

"And she picks the guys."

"And I'm picking you," she added.

"But our son-in-law, really?" he asked. "First you tried to talk me into picking my own daughter, now you pick our other daughter's husband?"

"Marcie is hot and she isn't my daughter."

"But she's mine!"

"Anyway...come to our room and we will show you a good time," Sandra said. "A night you will never forget."

Charles slid the door to the shower open and held out a hand.