Okay

Jack thought about for a few seconds and then asked "Do I get to fuck the both of you in the bum?"
"Bum, pussy and mouth. But we get to use your appartment sometimes just to be alone. So we can have some private time?"
Finaly Jack says "Okay."
With that Marge aplied some lube to his bum hole and some on the dildo.
Then Jack suddenly cried out "Hang on is that the 6 inch or the 10 inch dildo.
Marge leaned on his back. He could feel her boobs press against him as she whispered in his ear "To late."
He could the rubber head push at his spinkter. Once it opened up the shaft followed.
He started fucking Cindy and as he fucked her he fucked himself on the dildo.
He started feeling like he was the meat in a sandwich.
But Marge told him to stop. She then had him lay on the bed and had Cindy get on top of him.
As they changed positions he saw Marge had been using the 6 inch dildo. It had felt a lot bigger than it looked.
Marge wiped it off and started fucking Cindy's arse as she rode Jacks cock.