Julie's cunt was on fire as she watched them. There was more excitement in seeing her twins fuck than she had expected. She had never had a chance to watch anyone else fuck. She and her husband had used mirrors, watching then selves but this was more exciting. She inhaled the hot odors of fucking, of a boiling little cunt and a hard cock. The scents aroused her to a high pitch, her cunt bubbling and twitching.

She wondered, briefly, what her husband would have had to say about this, and decided he would have enjoyed it, maybe wanted to fuck Becky, himself. A momentary sadness at her loss came over her. It didn't last, though, because her cunt was burning hotly as she watched her son fucking her daughter.

"Listen to it!" Julie whispered. "Listen to that wetness! Ooooo, it's beautiful! Fuck her, Ben! Ohhhh, Becky, wiggle your hot little ass! Ride your brother's cock, honey!"

Wetness glistened on Becky's stretching cunt and Ben's cock, and Julie wanted almost desperately to get her tongue down there, to taste the fuck juices. She begun to suck on Becky's stiff nipple instead, her eyes turned downward to watch Becky thrust her cunt up and down, churn her small hips, fucking on her brother's stabbing cock.

The excitement the twins felt was overpowering their young minds, their senses. It couldn't last long. This was the first time Becky had ever had a cock inside her cunt, and she was going wild.

"Ohhh, I'm gonna come!" she shouted, bucking her cunt violently onto her brother's cock. "My pussy is on fire and I'm gonna come! Ohhhh, there! I'm coming!"

Julie made a hissing sound of pleasure as she saw her daughter's cunt gripping at her son's cock. The orgasm sent wild shudders through Becky's sweet little body.