"I wanna fuck, Robert!" she squealed hotly. "I wanna get fucked now! Playing with Kathy's cunt made me so hot! Come on, let's fuck!"

Cindy was on her hands and knees, her ass in the air. She bowed her back and arched her pussy toward her brother's cock as he knelt behind her. Kathy watched them with burning eyes, licking at her lips with desperate hunger.

Kathy mewled when she saw Robert's cock stab into his sister's cunt. Her own cunt began to twitch again. She watched Robert fucking fast into Cindy's tight, young cunt. Somehow Cindy had moved until her tight tits were above Kathy's face.

Kathy stared at Cindy's pink nipple. Cindy's nipple was rubbery, very taut, standing from the small fullness of her tit. It was sugary, sweet, and succulent. When Robert thrust his cock into his sister's cunt, Cindy's nipple brushed against Kathy's hips. Kathy strained against the rope, her ass twisting.

She found Cindy's nipple probing her lips, and then the sweet nipple was between them. For just a moment Kathy didn't believe it, then she began to suck on Cindy's succulent nipple greedily. Her lips pulled and drew, opening wide, her tongue fluttering back and forth.

"Ohhhh, Robert!" Cindy whimpered, "She's sucking on my tit! Kathy is sucking my tit!"

Kathy's mind was reeling with what she was doing. Her lips were hot and moist on Cindy's tit, her tongue licking hungrily. Her mouth burned and her lips tingled. There was a warm glow inside her squirming body, a glow that became hotter as she sucked in frenzy on Cindy's tit. The sounds of Robert's cock stabbing into his sister's boiling young cunt came to her ears, and she was thrilled with the heavy gasps of pleasure both brother and sister made.