"Really, Tracy?"

She nodded, grinning at him. "Really." Tentatively, as if expecting her to stop him, Bill cupped his sister's tit. He found it firm, yet soft. He gave her tit a light squeeze, making Tracy mewl in delight.

"You can put your hand inside, honey." Nervously, but eagerly, Bill slipped his hand into his sister's blouse and found her tit warm and naked. Her nipple was swollen and he twisted and pulled at it. Tracy opened her blouse for him, and Bill gazed with awe upon her creamy, flawlessly shaped tits, her nipples sugary pink and hard. He gulped with pleasure as he closed both hands around her tits, fondling them gently, but eagerly.

Tracy guided his mouth to one, brushing her nipple along his lips. "Suck it," she whispered. "Suck my titty, Bill. I like to have my nipples sucked."

"Really?"

"Oh, honey, stop saying that," she replied. "Yes, really it makes me red hot and tingly when my titties are sucked."

Bill probed his sister's nipple with his tongue, then swirled it around, finally taking it into his mouth. He gave a soft gurgle of delight and began to suck.

Tracy held her brother's head, holding his mouth tight against her tit, her nipple being licked by his tongue. She felt his cock pressing at her stomach, and shoved her hand into his pajamas again to fondle his ass. She pulled her hand between them, gripping his cock and feeling it swell into hardness once more. She gurgled with pleasure and stroked his cock tenderly. She fondled his balls, rolling them about in her hand.

"Mmmmm, you're getting hard again, Bill," she giggled with delight. "And so soon, too."

She squeezed his cock, making her brother moan around her tit. She giggled again when he tried to fuck at her fist, his swollen prickhead poking at her stomach. She let him rub his cock against her and clutched his ass again. "You want to fuck me again, Bill? Did you like fucking me so much, your cock got hard so fast?"