"Wouldn't you like to see my cock?"

"Not really!" Though she giggled again, she eyed the cock bulge in his jeans with interest.

"Aw, hell!" Billy let go of her shirt and stamped his foot with impatience. Then he started to undo the fly of his pants.

"Billy!" Cindy said, coming closer.

But Billy paid her no attention and concentrated on unzipping his pants, pulling them and his shorts over his erect cock and down his thighs.

His cock jutted out from his groin, the cock head aiming up at Cindy's face.

"Wow!" she gasped. She reached out and touched his prick daintily, then jumped back when it lurched and shuddered.

"C'mon – touch it again, Sis. It's okay. It feels real good."

Cindy giggled nervously. But she stepped forward and reached out for her brother's prick. This time, she slid the palm of her hand all the way up the cockshaft.

"Oh, Cindy!" Billy frowned and screwed his eyes up so that his face was the very image of lust.

Growing bolder, Cindy wrapped her fingers around the cylinder of cock meat and ran her fist down to the root and back up to the cock head.

Billy groaned as a drop of clear liquid oozed from the tip of his prick. "C'mon, Cindy. Take off your shirt!"

Cindy smiled shyly. She turned around with her back to her brother and pulled her shirt over her head, tossing it onto her bed. Her tits had only just begun to develop, so she didn't wear a bra.

When she turned around, Billy groaned with excitement, grabbing his prick hard at the base.

Cindy's tits were large pink nipples on small, firm globes of flesh that protruded only slightly from the rest of her chest. But the shape was perfect – like tiny smooth pears.

She was blushing prettily, staring down at her feet so she didn't have to look at her brother.

"Come here, Cindy," Billy rasped.

She hesitated for a moment, but when she walked up to him, he knelt down in front of her and reached up for her little tits. She gasped when he clenched the firm flesh in his hands and squeezed.