Tommy gave her a puzzled look.

"I mean, everybody else is kissing and cuddling, right? If we just sit here, staring at them, they might get suspicious."

That was logical, he realized. There was no harm in a brother kissing his kid sister, was there? Nor was it a hardship to kiss that moist, sensual mouth of hers.

Debby tilted her lovely face and Tommy bent down and placed his lips on hers. It was a light caress, mere sibling affection, to begin with. Tommy was surprised when he felt the tip of her tongue probe at his lips and then slide into his mouth. He sucked on it automatically and his sister gave a little moan.

Tommy drew his head back, shocked by her forwardness and by the way his own body had reacted. His balls were bloated with a cum-load, and his prick felt like a heated crowbar.

"Jeez, Sis, we better not kiss like that," he muttered. "It'll make us both horny and we won't be able to do anything about it."

"No?" she whispered, giving an impish look.

The wagon conveniently rolled again, and Tommy felt her thrust her tit out against his hand. He couldn't help but give that delightful tit another squeeze.

"I guess we'll just have to play with ourselves," Debby sighed, looking up at him through lowered eyelashes.

Tommy gasped at her boldness. He guessed that maybe his kid sister was pretty naughty on those dates she had. Debby giggled when she saw how her brother had reacted.

"Nobody will see us," she said. "You can jerk off under the blanket and I'll finger-fuck myself if we get too horny."

"Holy shit, Debby! That's real naughty!"

"Silly," she said affectionately. "Everybody fucks themselves off, right? No sense keeping it a secret."

Tommy was about to ask her, for more details about her self-abuse, totally fascinated. The thought of his sister finger-fucking herself to a creamy climax was wildly thrilling. But then Rebecca began to get even naughtier, and Tommy forgot about his sister for the moment, as he gazed upon the faithless tramp with jealousy and lust.