Centaur Upgrade

"Computer, I'd like to try the Centaur Upgrade." Samus said. Seconds later, a panel on a nearby wall opened up, dropping a small chip from a tube. Inspecting it, it seemed to be exceptionally plain, resembling a game cartridge or a memory card of some sort. Its most stand out feature was its coloring, a bit brown, but overall still gray as metal could be. Moving her hair back she placed the chip in the slot on the back of her neck.

Despite being inserted directly into her spine she felt no pain at all, all she felt was small electronic pulses feed into her brain, it didn't take long for her to feel the effects, completely disorienting her on her two legs. Which... Seemed to be expanding? Her ass flesh was rapidly growing, spilling forth as it was becoming more and more of a giant, dump truck ass. "Why the hell is my ass growing?" Samus said confusedly, gradually losing her balance due to her altered brain and behind. As quickly as the growth started, it stopped. Her ass was now giant, extremely wide and bubbly. Her legs expanded as well, seeming a bit bigger and a bit more muscular. at the same time her nether-regions grew extremely wet, drenching the bottom half of her Zero Suit in an instant, her pussy and asshole puffing up greatly in the process. "Jesus... I'm not even turned on?" Samus was confused as to what sudden **** wetness had to do with centaurs, but was quickly distracted as she felt her hips grow larger, widening enough to give her a heavy pear shaped figure.

It was then that her ass started expanding again, but not in the same way. It felt like it was being pulled out of her, small growths forming underneath each cheek. Each nub rapidly expanded more and more until each became a featureless duplicate leg, directly behind her regular legs. "What the hell?" Samus thought, completely shocked at her new, freakish, 4 legged appearance. Before she had a chance to ask the AI any questions, her second pair of legs shot out, as if pulled by an extremely powerful ****. Her zero suit couldn't handle the sudden growth, but rather than ripping it simply shrank to only cover her upper body, leaving her completely naked from the waist down, allowing her pussies wetness to trickle from her hindquarters down onto the ground, gently splashing in the process.

She was now a centaur, or, a human-taur. It was clear the transformation wasn't complete, now she was just a human that looked like a centaur, with no tail, hooves or fur. The Upgrade was quick to fix that as Samus suddenly felt a chill run over her lower body, every piece of skin on her horse like second half felt like it was being poked and prodded, but not in a painful manner. A wave of fur began to sprout out of her skin, washing over her horse-like flanks, rapidly growing and taking a bright blonde color in accordance with her hair. Next, all 4 sets of her legs began to rapidly change shape, quickly and precisely enough for her to not fall over in the process. In that instant, she felt them lengthen, pushing her multiple feet into the air, making heemr taller in the process. A blonde horse tail erupted out of her behind, quickly growing to be very long, enticingly covering her inflated genitals. As she rose in height her still re-shaping feet hardened on the bottom into hooves, her body had now taken the full form of a centaur. But she could vaguely feel more changes coming on.

Her inflated pussy and asshole fit perfectly on her new, blonde furred horse body, the wetness was right at home in her expansive, musky folds. She couldn't see it herself but could feel the puffiness below. Samus was enraptured by the scent of her lower lips, until she brought her attention to her chest, viewing her regular sized boobs with scrutiny. She had always wanted to be a bit bigger than a meager C cup... Lucky her, the girls started growing before she could catch them, pushing against her hands as they shot up to hold the growing tit flesh that was quickly expanding to the size of melons. Spilling through the cracks of her fingers they grew to the point she couldn't hold them anymore, lowering her hands to gently cup them from below. Her nipples grew to match, hardening as they poked into her Zero Suit with all their might, obviously displaying how big and hard they were from within. Samus' new boobs fit her body perfectly, not sagging too much but perfectly sitting on her much higher up chest. She now had a perfect hourglass figure on top of her horse half and a bubbly horse butt on the other half.

Samus tried to lift her legs independently, finding it extremely easy to move them, to her surprise. "Wow! It's like I've been a centaur all my life! I expected it to be much harder learning how to walk again..." Smiling happily at the discovery she began to trot around the room, lucky her brain had been altered to comprehend her new body, allowing her to walk easily. The sounds of her hooves clopping against the ships metal weren't loud either, she knew how to walk casually.

Samus walked over to a nearby mirror to survey herself. She saw a beautiful girl with big, well shaped boobs on top of a gorgeous, perfectly groomed horse body, her upper halves wide hips meeting halfway down. She looked not only majestic, but extremely sexy, if this was her real form she'd be a bombshell amongst centaurs. Her legs were much more muscular and capable now that they were in horse form as well, giving her a lot more combat potential.

Samus was mostly happy with the changes, she was elegant, faster, stronger, her big boobs were even better, as was evident by her puffy nipples jutting against her suit. And the smell of her pussy made her deliriously horny, but she couldn't even get close enough to masturbate. She came to the conclusion she could either keep the upgrade, get rid of it, or ask the AI for compatible upgrades or suggestions.