"Oh!" Jennifer exclaimed, stepping into the arbor and finding her brother there.

She was annoyed, wanting privacy to play with her pussy, and started to turn away.

Then she noticed Joe's swollen crotch.

Too excited to act modest, Jennifer inclined her head at her brother's groin.

"You been spying on me?" She giggled.

Joe looked sheepish.

"You gonna jerk off, or what?" she asked. Joe blinked, startled by his kid sister's boldness. Then the lad realized that she, too, was sexually aroused. The crotch of her bikini was soaking wet and a trickle of pearly cunt-nectar glistened on her inner thigh. Nor was Jennifer making any effort to hide her horniness. She was even standing with her legs apart.

"Errr – yeah, I guess," he muttered.

"Oooooh – can I watch, Joe?" Jennifer squealed.

"Jeez, Sis…" he croaked.

It amused Jennifer – and greatly increased her confidence – to realize that she was more forward and less inhibited than her older brother. She felt wondrously naughty. And as long as they just looked at each other, it wouldn't really be like incest, she reasoned.

"Wanna see me rub my cunt?" she chirped. "I'll finger-fuck myself and you can jack off and we can watch each other while we cream, okay?"

Joe groaned. A damp, sticky patch spread out where his cock-head flared in his jeans. The youth could hardly believe this was happening. He thought that so much blood must have rushed into his cock and balls that he had blacked out and was having a wet dream. He closed his eyes.

Then he opened his eyes again and saw that Jennifer had her hand pushed down inside her bikini panties, cupped over her cunt-mound and slowly moving.