Your attention was drawn away from the mare for a moment as you bent down and picked up the object with your stiffening fingers. It wasn't easy to pick it up for some reason, but you managed to grip and picked up a gold necklace shaped like a heart with a name engraved in it and your eyes went wide.
It had your girlfriend's name on it, it had actually been a gift from you to her and you remembered giving it to her quite distinctly. How was it possible it was here in the stall? Had she dropped it or something else?
"Well, well, it looks like you're getting pretty close to finishing," the attendant's voice said from behind you and before you could say anything you felt a pinch as something was injected into you as she backed away and shut and locked the door.
"What are you neighing," you started to say and put your now fused hand or hoof on your mouth, did you just neigh? You tried to protest more as you just wound up letting out more neighs and the woman just laughed as you fell forward onto all fours.
"Sorry you had to do this the hard way, but now you have a choice," the woman said with a laugh as your face pushed out into a muzzle. "I injected you with a special formula that increases your sex drive once its active. You can either mount the mare now and finish both your transformations with your mind intact or you can wait and lose your mind. The longer you take, the harder it'll be to come back to humanity."
You stomped your hooves agitated, but you could feel your arousal growing again. Your tail grew out as your now horse body finished its transformation.
"You're a tough one just like your girlfriend there," the woman said with a smile. "We could have easily done this to her, but since she was waiting on you I thought we could get two for the price of one. If you do what we tell you, then your life will be a lot more comfortable."
Your mind was starting to get overwhelmed by your new horse instincts, what do you do now?