Quite a while

John let Penny do most of the work, seeing as how she was bucking back and forth like the sex machine she now was. John came in her ass eight times, but she didn't orgasm like a good little doll.

"How do you feel, Jeannie?" he asked.

"I want you to fuck me, Master," Jeannie said.

"Well," John said as he withdrew from Penny's now leaking ass. "Maybe I will."