"Those are my balls," he explained. "They store up the cum that I shoot."

"Gee, boys are funny," she giggled, still gently fondling his balls. "I like touching you down there. It makes my pussy all hot and wet.

"I'm glad you like it." He grinned. "It really feels good when you mess around with me."

Releasing his balls, she began tenderly caressing his limp prick. She couldn't get over how nice and warm the velvety skin felt against her trembling fingers.

His cock reminded her of a warm, fat worm in her palm as she closed her fingers around his prick. Giving his cock a loving squeeze as she instinctively pulled back on his loose foreskin, she was pleased and excited to see the end of his pink cockhead peeking out.

"Hey, do that again," he urged, loving the way his sister was fondling his prick. "Pull the skin back and forth."

When Amy did as he suggested, he could feel the wild pleasure streaking up and down his cock. Shit, it felt a million times better than jacking himself off.

Getting hornier by the second, Jimmy could feel his cock starting to twitch and swell.

"Hey!" she giggled as his cock started to throb and swell under her caresses.

"It's moving. What's happening?"

"I'm gettin' a hard-on," he said excitedly. "Just keep doin' that."

Remembering how hard her uncle's cock had looked, Amy stared in amazement as Jimmy's prick swelled bigger and bigger in her hand. His cock continued throbbing and growing until his prick was standing up stiff and straight in her grasp. His cock wasn't as huge as her uncle's, but it still looked awfully big and hard to the excited little girl.

"Does it feel good to have a hard-on?" she asked, thrilled by the way his hot erection was throbbing in her hand.

"Shit, yes!" he exclaimed. "But it would feel a lot better if you'd slide the skin back and forth."

Trembling with horny excitement, the little girl took her brother's loose foreskin between her thumb and forefinger and began peeling it back down over his stiff cock. Her eyes became larger and larger as the shiny pink flesh of his protected knob began to appear. She stared at the little hole on the end of his gleaming cockhead.