Victoria's eyes went wide as the anthro zebra stallion got closer, she knew she was about to lose what was left of her humanity. She wasn't going to let it go without a fight and struggled against the Gorillas that were holding her, while they were strong she was still part horse and had what advantages that had.
She managed to free herself a little and tried to grab at the syringe to take it away from Steven. A struggle ensued as she tried to take it away from him, and after a brief struggle a surprised bray was heard when the syringe pierced Steven's skin. He tried to take out a second syringe but he stumbled with his hardening hooves.
"You biiii..." he said but it was cut off by a bray as his body barreled out, destroying his clothes as he fell forward onto all fours, his body losing its human aspects as he became a full Zebra stallion.
"Sorry boss..." one of the security Gorillas said but reached down and grabbed the remaining syringe as the transformed owner snorted. "You'll get your revenge though."
Steven's mind was already fading, he could already smell the nearby mares in heat, even if they weren't Zebras he couldn't help but become aroused. He could smell the scent of heat coming from the mare in front of him, his last human thoughts were that of horror as he realized he was going to be a Zebra forever and be used to breed and transform new mares.
Just like every other animal in the Zoo. His mind faded as his cock slipped out of its sheath and he snorted as he looked at Victoria.
The security man injected Victoria as the changes started.