Mark didn't let her

Joan wanted to step back and take her thong to put on and put her softening penis in it, but she was stopped. "More." Mark said exhausted. "Fuck me more."

Joan looked back at the boy, who was still had the mind-blown look on his face. She didn't want to do it from the bottom of her heart, but Mark's begging had caused the male side of her desires kick in. "O.K. I'll do it." She said as her cock got hard again. Again she bent over his body and guided her cock to his asshole. Joan thought she saw a smile on Mark's face as her cock touched it and, as she shoved her cock in, Mark continued to moan like a girl getting her brain fucked out. It was an arousing side that turned Joan even more on.

Three hours later. Mark's father entered his house. He had come back from work and wanted to enjoy his time at home. He heard high pitched moans filling the entrance. "Must be Mark's girlfriend." He said not pleased to be disrupted by them being so loud while having sex. And it even came out of the living room. He didn't want to hear or see it, but as he passed the open door, he caught a glimpse of the scene. He turned his head and looked at it. "Oh! My! God!" He exclaimed and put his hands over his mouth.

What he saw was like nothing he had ever seen. Across the room was sitting a mature woman with long wavy brown hair around her beautiful face on the couch. She had wide hips and huge augmented breasts. On her lap bounced a slim body up and down. The person faced him and had a blank, lust filled expression on the face. It had the body of a boy, the soft penis bouncing around in his lap. It was Mark and he was more or less actively bouncing up and down on Joan's lap. The high pitched moans came out of his mouth as he enjoyed what he was doing, riding Joan's huge cock with his ass.

"Welcome back, Mr. Millers." Joan said with a wicked smile after she noticed Mark's father.