The package arrived the next day. Hailey opened the box, bit her lip, boldly took off her bottom and started unpacking. Wow. It really was beautiful. A smooth, elastic surface of the controller (the shape with the three extensions was unmistakable), thin plastic cables (only a few of them; the thing was mostly wireless), soft silicone rings, straps, and the manual (she didn't really need it, she'd already read everything online). Hailey read the first step and grinned, almost not blushing anymore. Ok, let's do it!
She sat down on the carpet, spread her legs wide and started gluing the sensors, putting on the toerings and adjusting the straps. Finally, she lubricated the controller and slowly pushed it in, both holes, the whole length. Ohhh... She wasn't a virgin, but the sensations were still unusual.
She stood up, took a few steps, turned around, squatted... Everything held. Not bad. And it did not restrict her movements...
She sat down in front of her laptop and flipped the switch on her hip. The computer immediately recognized the new Bluetooth device and began installing the drivers and training software.
Hailey followed the calibration wizard, smiling shyly during the tutorial part ("Move right toe up... Raise your left hip... Tense both buttocks... Squeeze vagina...")... and finally got to the training part. The program was a simple platformer/runner game that gradually increased in complexity, introducing the controller features one at a time. Hailey obediently moved her toes, squeezed her vagina and anus, and laughed out loud. That was so weird!
She continued. Now she had to work the same muscles separately: right hip, left hip, vagina, right toe, left butt... She had no time to think about how she looked now, wiggling her whole bottom in fine little movements, otherwise she might be embarrassed.
The game turned on the vibration feedback. It was really fine-tuned, her feet, hips, buttocks and all her private parts separately. Soon she could steer almost without looking at the screen, just by the tactile feedback. She ran faster, jumped three platforms in a row, caught the diamond... and the pleasure slowly building inside her exploded, flooding her entire body. Hailey let out a soft cry and shook, her eyes closed and her mouth open, her face red and sweaty.
Ohhh... She relaxed and looked at the screen. The game was paused. The orgasmic safeguards were really working.
Hailey smiled dreamily. She liked this thing! She took a deep breath and started the next level.
***
She mastered 5-Fit in two weeks. Not only for gaming, it made her 3D design work a lot easier, and for 2D painting she no longer had to look away from the tablet to switch layers, colors and everything else with her bottom (Photoshop even had a plugin for that!).
The control allowed her to detach the leg parts, leaving just the butt, vagina and anus, and control her mobile devices on the go. Hailey achieved such precision that the butt-dialing stopped being an annoyance and became a real thing. She could even text hands-free. And just unexpected incoming calls, with vibrator notifications, sometimes took her off guard.
Her friends - almost everyone had bought 5-Fit by now - were just as excited.
There was another effect. Hailey had no boyfriend, but when she went on a random Tinder date and had sex... mmm... wow. Her partner was amazed at how flexible Hailey was. They tried every position imaginable, and even some unimaginable ones, and she could squeeze, twitch, and shake her bottom whenever she wanted! Hailey had orgasms, lots of them, and her partner had all of his, more than he expected.
***
