"Stick it in her," giggled Heather. "Don't be afraid. She'll love it."

"Wow!" he gasped as he sank his finger into the juicy warmth of her tiny cunt. "It sure feels hot and slippery in there."

"It's supposed to," giggled his big sister. "That's why cunts are so much fun to fuck. Now pump your finger in and out."

Penny let out a wild squeal of joy when Billy began briskly finger-fucking her.

"Does it feel good, honey?" Heather excitedly asked the cute young girl.

"Yes! Yes!" cried Penny. "Faster, Billy, faster!"

The adorable redhead was soon writhing all over the sofa as Billy's finger zipped in and out of her hot young cunt.

"Oh, Billy!" Penny cried out. "It feels so good! Oh, God, that feels neat!"

"Rub her clitty," Heather suggested, pointing to the nub that was just inside the top of her pussy slit.

"What's that?" asked the boy.

"Her clit," answered his big sister. "Just rub it and she'll love it."

That was the understatement of the year. The moment he touched her clitoris, Penny went into a wild frenzy and began hysterically screaming.

"Yes! Yes!" the cute youngster shrieked. "That's it, Billy! Oh, shit, it's so good so… so good! Oooooh! Aaaggghhh!"

Within a matter of seconds, Penny's shuddering body exploded into a wild lurching orgasm. She'd never experienced such ecstasy in all her young life.

"Was that nice?" Heather asked when the young woman finally recovered from her traumatic climax.

"Gee, yes," giggled Penny. "I've never felt anything so wild in my life."

"Have you ever heard of fucking?" the older girl asked.

"Sure," answered Penny. "Everyone talks about it all the time at college."

"Well," smiled Heather. "That feels a lot better than what Billy just did to you."

"That's what the older college girls tell me," blushed Penny. "And I'm gonna try it when I'm old enough."