Tommy fingered his weeping cock, stroked his cock and fondled his balls in a preliminary caress, a sort of solitary foreplay. His other arm was still around Debby, his hand on her pert tit, and she was resting her head against his shoulder.

He wrapped his fist around his cock and started to slowly frig it up and down under the blanket.

Debby whimpered and turned toward him, eyes glowing with the heat of her arousal.

"You're jerking off, ain't you?" she whispered.

Tommy blushed, but there was no point in trying to deny the obvious. He nodded, grimacing.

"I gotta," he rasped.

"I know," she said. "I sin, too."

Tommy gulped. He looked down, and saw that the blanket was shifting over her crotch. Gazing into each other's face, brother and sister sat there, side by side, playing with themselves.

"Can I watch you?" Debby pleaded. Tommy hesitated, knowing that it was wrong, yet wanting very much to have her eyes on him and to watch as she finger-fucked her pussy. He frowned, struggling with his conscience.

Debby grinned at his discomfort. She was bolder than he was. She raised the edge of the blanket and looked down at his cock.

"Ooooh, you're so big!" she gasped.

Her gaze burned into his cock like a laser. Tommy pumped down to his roots and his cock-head flared, oozing cum. Debby lifted the concealing blanket a bit higher.

"Look at me, too," she whimpered.

Her skirt was up above her hips, and she had one hand cupped over her pussy, squirming against it and rubbing her pussy through the silk of her tiny, bikini panties.

Tommy stared at her pussy. The crotch of her panties had been succked up into her fuck-slot, and he could see a hairy, pink cunt-lip on either side. The outline of her trembling clit poked out against the sodden material.