Karen slowed her hip movements, then stopped. She sat up on her son, her cunt still around his cock.

"Don't stop now, Mom!" Tom protested. "Don't stop now!"

Karen laughed. "I'm not going to stop, baby," she said. "I'm just getting started."

She sat on him, her ass spreading. Susan saw Karen manipulate her own nipples, the expression on her face twisted in ecstasy. Susan gazed with unfocused eyes at Karen sitting on her son. Although her vision was blurry, she saw in detail the way Tom's young balls seemed to writhe, the base of his cock being gripped by his mother's wet cunt.

Then Karen began to bounce her ass again, bracing herself with her hands on each side of her son, her naked tits jiggling. Susan watched Karen's ass rise and fall slowly at first, then the movement increased in speed. Karen was mewling loudly, her head thrown back and eyes closed as she bounced up and down on Tom's cock. Tom was grunting, his fingers digging into his mother's thighs up close to her hips. His lips were clenched tightly.

"Ohhh, baby, baby!" Karen whimpered in a tight voice. "I'm going to come, baby! Oh, God… I'm going to come!"

Her ass began to grind in a frenzy against her son's deeply buried prick, and then she yelled. The sound came out in painful ecstasy, her naked body shuddering. Susan saw Tom arch his cock upward, and then his balls drew tight against the base. Susan saw his balls flex tightly.

"Mom, I'm coming!" Tom shouted. "I'm coming, Mom!"

"Oh yes! You're coming, baby!" Karen replied in a voice that sounded strangled. "I feel you coming! I feel your cock… coming! You're coming in Mother's cunt… come in my pussy! Oooo… oh, baby, baby! Come in me! Flood my hot fucking cunt! Spurt it into my wet pussy!"