Thanks for the request and idea from Sjeiejsjns 😊 the actual request was for arms-off but I couldn't quite get it to work, but will keep trying and probably post a variant armless version.

This might be the longest I've been able to stick with a single idea. Also I've told to keep it classy around here so I'm afraid you'll all just have to imagine the gigantic horse penis 😅

Part One:

Part Two:

Part Three:

Part Four:

Part Five:

It was the night before the race. Katherine had bedded him down in the stable hours ago but Aiden still lay awake in the hay. While his human knew intellectually he needed to sleep, his animalistic machine half stirred restlessly, tail swishing, legs stretching, iron hooves scraping against the stone as if in practice for the race ahead.

He'd never once been so nervous about a race, even in his motorcycling days. Those had been dumb, carefree, teenage fun - precisely how he'd ended up in the accident that cost him his legs in the first place. This race felt more important. A chance to fix past mistakes. He'd never get his legs back but at least he would recover some respect as a racer.

If perhaps not as a man, he thought, looking down at his jutting pink breasts molded out of jiggling rubber, cringing at the thought that the race was to be televised. He told his girlfriend not to watch. At full speed or on the hurdles, they were a sight to behold. He'd asked Katherine to ask the engineers - since she'd interposed herself so much in his design and development - if their size could be reduced. She'd quickly assured him that was impossible. They were "vital counterweights or something".

It was a wet night. The rain dripped through the stable roof. He shivered inside the steel suit. Why hadn't Katherine activated his internal heating elements before retiring to her warm bed in the farmhouse? he grumbled. Didn't she know how important sleep was? The ExoSuit demanded complete focus at full gallop, since four legs didn't exactly come naturally to a human brain. The slender mare frame held enough horsepower (one, he supposed) to just about keep pace with the stallions, but that assumed he made zero mistakes. If he was in the zone, fully inhabiting the gait and physicality of a mare, surrendered to the natural flow of four legs, they stood a chance of winning. But a single distraction, a stumble, a 5% reduction in response time from a sleepless night, and it was all over.

Knowing this, his mentor and rider had been wise to move the stallions to the paddock at the far end of the farm. She knew how distracting they were, maddeningly so now that the suit messed with his blood when it sensed the proximity of a male. His equine-shaped half, which had half a mind of its own since the programming update, had become almost willful since being denied the attention of a stallion. With its electrodes plugged directly into his subconscious nervous system, it knew what he wanted better than he'd ever consciously admit.

Around 2 am, just as he was finally slipping away to sleep, he heard the 'click' of the paddock gate. Aiden's heart sank, his stomach did cartwheels, while the rubbery additions installed within the suit made their own automated preparations as hoofbeats approached. Maverick poked his head inside the stall, seeking out his favorite toy. His warm body was soon lying in the hay beside her. Chemical senses in the suit went wild as they detected unmistakable pheromones. A subtle hiss came from within the suit as a payload of estrogen was injected into the biological component. Aiden groaned, suddenly wide awake and eager, the hormones more effective than a triple espresso.

"How the hell did you get out? That gate is supposed to be locked," Aiden groaned at the dumb, eager animal. The helmet filtered his speech into a curious equine whinny.

Another stallion entered, then a third, and the petite mare soon found herself within a press of hot, muscular flesh. The suit hummed with electronic pleasure as reward protocols were applied to exposed nerves for his acceptably mare-like conduct. Over the sound of the rain, Aiden heard the clack of Katherine's boots creeping back to the farmhouse.

"She opened the gate. She's sabotaging the race. She wants me to lose!" he realised.

It would be a sleepless night.