"Cool it," Skip said. "No need to hurry. I'm gonna take it easy with the folks gone, take a vacation of my own, not bust my ass rushing around doing homework and stuff. It's gonna be a relief having them off my back for a few weeks."

Jenny brought her legs together and slid down off the balance beam. As her feet hit the mat, a wave of dizziness caused her to lose her balance, and she staggered. She'd literally knocked herself out by overdoing her exercises.

Skip caught her before she fell, and her head fell against his chest. "Hey, are you all right?"

Wrapped in her brother's arms, Jenny started to tremble, and Skip held her tighter, pressing up against her. He stroked her head. His leg pressed up between her thighs, rubbing hard against her crotch.

"Sis, what's wrong?"

A wild excitement saturated Jenny's loins and suddenly she found herself in the throes of an orgasm. She clung to her twin brother, her body shuddering, her spasming teen crotch pressed to his muscular thigh. Her eyes rolled back and her bare toes clutched at the mat. The orgasm lasted only a few seconds, then passed away as quickly as it had come on.

Jenny pushed out of her brother's arms, trying to laugh. "I'm all right. I think I hyperventilated or something. I was doing some deep-breathing exercises before you came in."

Skip studied her. "I thought you were gonna faint. You sure you're all right?"

"Of course, silly." Jenny did a cartwheel to show that she'd regained her balance. Her ponytail flip-flopped.

"If you say so," Skip said. He picked up his gym bag. "You know how to operate the washer and dryer? I got a shit-load of workout clothes to wash."

"I'll wash them for you," Jenny said.

"I can do it," said Skip. "Just show me how to operate the machines."

"I said I'll do it," Jenny said, taking the gym bag away from her brother. "And dinner will be ready in a half hour."