Paul looked down at his sister. God, she was good-looking! He reached out to touch the round, upturned breasts, then stopped. He closed his eyes and threw his head back.

"Robin, please don't do this," he said. "Please… please… oh, fucking Jesus H. Christ! God, suck it, you fucking cocksucker!"

Robin was more than surprised when Paul's enormous cockhead slipped forward, scraping against her teeth, the slapped against her nose. She looked up and saw her brother fumbling with his clothes, dancing on one foot.

"Baby sister, you asked for this," he said, tearing his shirt off. "And by God, by fucking God, you're going to get it!"

Robin could hardly wait. But then, she didn't have long to wait at all. In record time, Paul shucked off his clothes and bounced on the bed, jamming his knees against her shoulders. He held his prick in both hands, aiming it toward her mouth. His cock was so hard, so engorged with blood, the movement was painful.

"Suck it, little sister!" he groaned pressing his cock against her lips. "Suck my cock and eat all my cum!"

At the same moment she lunged forward, engulfing his gigantic cockhead with her lips, Robin felt an explosive climax thunder into her cunt. It was nothing like the feeling she experienced when she used to dig her finger into her pussy and get a satisfying release before sleep. This was a crashing, electric, all-consuming fireball of pure, raw pleasure. Her entire body began jerking uncontrollably.

"Aaauggghhfff!" she gurgled, sliding her lips lower toward the base of his cock.

The heat of her body, the fire of her first, animal-like orgasm seemed to pour into Paul's body. He grabbed his sister's head with both hands and jammed her face into his crotch.

"Good!" he yelled. "So fucking good! Suck it, you cum-licking little cocksucker! Take it in your mouth and eat it!"

Robin gasped for air, the noise of her inhaling causing a gargling, smacking noise. Then she pursed her lips and jammed her mouth around the base of his prick. His balls turned against her chin with vibrating warmth. She stretched her lower lip out, trying to pull them into her mouth.