Sue Only Uses The Feature For Private Time

The Invisible Woman still used the exercise ball for exercise. In the morning and during the day, she still took a few minutes to get a few squats in, to bounce on the ball, her lower body pressed down until the saddle began to vibrate. She could almost feel her thighs and glutes develop, and she welcomed the pleasant soreness and tiredness as she kissed her husband goodnight and went into the bedroom for one last, "private" workout.

Door locked. Pants off. Sue Storm pressed the button and watched the phallus rise out of the middle of the saddle. She licked her lips, nervous. Of course, it wasn't like she was cheating on Reed. It was just a sex toy. Like the small vibrating egg and the smooth glass wand she kept tucked away in the back of her closet, alongside the small bottle of lube she had been gifted at the last bachelorette party she had attended.

No, she corrected herself, an exercise device. This is for my health.

Or at least, that's what she told herself as she dabbled lube over the protrusion. While she felt a little wet herself, a little more lubrication was always a good idea. Especially considering how long it had been since Sue's pussy had last had a visitor.

With a flutter in her stomach, Sue stood astride the exercise ball. With great care, she tried to align herself...and, when the angle was awkward, she sighed and made most of her lower body transparent, only her labia visible. That took concentration, but it allowed her to easily line herself up with the smooth, rounded, bulbous tip of the toy and...

Oh.

Sue froze in place. Her sore thighs quivered, and her eyes closed as she felt the sensation of something inside of her for the first time in what felt like ages. It didn't feel like Reed—there was nothing of the warmth and give of a real prick—but as she slowly slid down its length, she could feel it stretch her inner muscles slightly. Muscles which had not gotten much use since Valeria had been born.

She bit her lip as she pushed down and down. Every inch made her stop and take a moment, to breathe and relax, to tamp down the excitement and allow her body to get used to the intruder. Her thighs quicked and burned, and a part of her just wanted to slam her pussy down, but Sue knew that would just end up hurting her.

Finally, after what felt like an eternity but was closer to eight minutes, Sue's weight settled down into the saddle of the exercise ball, the whole mass of the toy inside of her.

It felt...well, it felt like something that tried to poke her in the cervix. But that feeling of fullness after so long was delicious.

Then it began to vibrate.

That caught the Invisible Woman off-guard, though she knew logically that it shouldn't. The sudden mechanical buzz was nothing compared to the sensation of the toy as it wiggled around inside of her tight twat. Sue looked down, her lower body still invisible, and watched with fascination as the toy was a blur inside of her.

She didn't try to bounce up and down on it. Not right away. Instead, the blonde rocked on her heels, back and forth. She let out a soft moan as it touched her here and there, the vibration intensifying with her movement as she angled it to find her g-spot and stimulate the hell out of it. Her right hand clutched at her clit and began to rub, even as she moved back and forth, her ass firmly planted in the saddle to maintain the vibration, her left hand on the rear of the ball to maintain her balance.

Something built inside of her. A warmth and excitement that grew and grew as her breath grew ragged and her moans louder. Now it was her calves that burned, as her feet rose up onto tip-toe, the toes clawed at the carpet as Sue rolled and pressed her cunt down hard on the saddle, to better let the vibrations hit her most sensitive spot.

Until something broke. It happened too fast. A sudden burst of speed as the vibration suddenly changed, intensified. The toy seemed to swell at the entrance of her quim and Sue's vaginal muscles clutched down on it in response. She stared down at her invisible self and gasped as something shot out of the end of the phallus she was riding and into her body...and then Sue screamed as a burning heat enveloped her greedy cunt, every muscle in her body contracted as an electric wave ripped through her, and Sue quivered in catatonic shock for a moment as her mind went absolutely blank.

The orgasm lasted, perhaps, five seconds.

Then Sue sat there, ragged, spent, dripping with sweat, the dildo vibrating normally inside of her twitching, spasming pussy as if nothing had happened. With an exertion of will as much as physical ****, Sue stood, and came off of the dildo with a wet squelch. Something wet and frothy dripped from her poor hole.

"What...just happened?" Sue Storm asked herself as she staggered away from the exercise ball and toward the bathroom.