He started to fuck hard into her, his hands pawing her breasts, caressing her hair. He pulled her hair, jerking her head to one side as his tongue rammed into her mouth. His ass rose and fell furiously as he drove his cock in and out of her box with relentless fury. Her tight slit squeezed his prick as it slid in and out. He grabbed her head in both hands and pressed his mouth against hers with bruising force.

***

Mark flushed the toilet and opened the door to the hall. He walked back down to his room, yawning slightly.

Strange sounds coming from Jody's room stopped him in his tracks.

He turned toward the door and pressed his ear against it. It sounded like moaning and groaning. He felt his pecker harden. He shook his head in amazement. Was Jody jerking off in there? He heard the springs on her bed bouncing and his cock stiffened even more. Boy, she must be really getting into it in there.

The door had a lock, but it was one of those bedroom locks, the kind with the little round hole in the doorknob that would open the lock if some little kid got stuck or something. He opened the closet and pulled out a hanger, then straightened the end. The hall was dark and he had to carefully slide the tip of the hanger around on the doorknob before finding the hole by feel. It slid in and pressed against the lockbar.

There was no sound as he slowly turned the handle and slid the door open a crack.

To his surprise, the light was on in her room. He peered in and barely held back a yelp of surprise. Jody wasn't alone in there! He instantly recognized his father as the big man humping down into Jody. His father's hairy ass rose and fell atop the small girl as he drove his prick down into her cunt.

Before yesterday, he would have rushed in and attacked him. Now, he felt his cock go rigid in his underwear as he watched the lewd spectacle of his father pounding his cock into his sister's box.