Tracy, holding her skirt high, spread her knees over her brother's thighs. He gazed with unfocused eyes at his sister's cunt, excited to see the wet pinkness he had been trying to see for a long time. It was hard for him to believe that his sister was going to fuck him, and his cock throbbed until he thought he would come before it was inside her.

"Watch, honey!" Tracy mewled. "Look at my cunt suck your cock in!"

She held his cock at the base, rubbing his swollen prickhead back and forth over her fiery cunt. Finally she settled slowly, the head of her brother's cock spreading her hot cunt. Bill gulped when he felt that hot wetness engulf his cock. The hairy lips of his sister's cunt moved down slowly until he could no longer see his cock.

"Is it nice?" Tracy whimpered, the lips of her pussy squeezing his prick. "Am I hot and wet for you, Bill?"

He nodded as his sister sat on him, his cock buried deep. When she started lifting and shoving on his cock, he dug his hands into her thighs, trying to keep from coming too fast.

Tracy understood. "Don't worry, Bill," she whimpered. "If you come, don't worry about it. I'll fuck you again!"

Susan could no longer keep from looking. If they saw her peering around the door, that was too bad. She twisted from the wall and peeked, her hand still inside her panties. She saw her daughter leaning over now, her hands at Bill's shoulders, her exposed ass plunging up and down, her cunt stretching about his cock. From her position, she could see it all. The sight of her daughter's naked ass riding on Bill's cock gave Susan an almost overpowering urge to run to the bed and shove her face down between Bill's legs and lick at his sweet looking balls. She wanted to run her tongue up her daughter's cunt and lick that pretty ass. Instead, she plunged her finger into her cunt.