M.A.R.E. Upgrade (Anthro Horse)

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Samus delved into the vast catalogue of upgrades, her fingers tracing over the screen as she weighed her choices. The vast array of options was staggering, with some enhancements boasting amplified strength, others promising unconventional sensory experiences, and a few bearing enigmatic warnings.

One entry in particular caught her attention: M.A.R.E. Patented Slut.Co technology* The description that followed piqued her interest:

"A transformative upgrade designed to reshape the wearer into an equine-human hybrid, enhancing physical capabilities while imprinting instinctual equine behaviours." A spark of intrigue ignited within her, prompting her to consider the possibilities of this unusual upgrade. She didn't know why it was spelled in capital letters with punctuation, but perhaps whoever designed it simply thought it looked cool.

Her finger hesitated for a moment before making the selection. Is there really no information on this? She scrolled through a dozen pages with potential side-effects, disclaimers and legal stuff but couldn't find anything that described what exaclty M.A.R.E. stood for other than an anthropomorphic mare alteration. With a single tap she selected the upgrade, and the M.A.R.E. chip was activated, and the port at the base of her neck sprang ready to receive the implant, she reached for the chip and inserted it in the slot.

The transformation began with a gentle warmth that spread through her limbs, her muscles flexing as they underwent a rapid reorganisation. Her boots creaked in protest as her feet merged into a single, hoof-like structure, puncturing through the sole. The keratinised surface hardening to replace the once soft bottom of her feet.

More creaking as the Zero Suit's fabric started to strain in order to accommodate the changes in her thighs, which were now thickening into powerful, muscular haunches.

A dull throb came from her coccyx (Tailbone), vague at first but increasingly growing in discomfort.

As the transformation progressed, a searing pressure built at the base of Samus' spine, forcing the Zero Suit's fabric to its limits. A low, tearing sound filled the air as a tuft of silky hair burst forth, her tail emerging in thick, shuddering increments like a bird's newly formed feathers. The blonde strands quivered with involuntary twitches, as if already attuned to her newfound equine instincts.

With a gasp, it emerged in full flowing and flicking graciously above her rump as the suit started straining for her expanding physique when her hips POPPED. With her expanding physique, the fabric groaned in protest as her muscles rearranged themselves to accommodate her new, hybrid form, her legs letting out pops and knacks as they rearanged her stance as if she where walking on high heels or preparing to dance ballet.

"Procedure is highly effective, efficiency 70%" the Ai anounced to no one in particular as Samus was alone and had not requested such data.

Samus's gasps grew more ragged as her body continued to shift, her fingers spasming against the monitor's surface as they elongated. The unfamiliar weight of her new hooves sent her stumbling, forcing her to adjust her stance to compensate for the added bulk of her haunches as her glutious maximus continued to swell in size. Her tail trashing behind her, responding to stimuli she couldn't yet understand.

Her gaze swept the screen, **** for a way to stop or reverse the transformation. The M.A.R.E. upgrade's influence coursed through her, a steady, insistent thrum that reshaped her very physiology with each passing moment.

Panic set in as she realised she was losing control, her body changing in ways she couldn't anticipate, her mind fogging in ways she didn't comprehend.