Aaron had recently begun a new job after losing his last one for being caught having “personal time” in the bathroom.  This new job was a janitorial job for a company that manufactured farm and livestock equipment.  He didn’t work in the factory, he was a janitor in the business offices.
	Not only did this office handle the business side of things it also housed their research and development department.  All the company's new products were designed and tested here.  They also built and stored said prototypes here.
	Now none of this mattered to Aaron.  All he cared about was just getting his job done so he could get back home.  He didn’t mind it though.  He worked night shifts.  He was clocking in as everyone else was clocking out.  This meant he was left alone for his entire shift.  The majority of his job consisted of taking out the trash from the various conference rooms and offices.  Gather all the trash, then take it out back to the dumpster.  
In order to get to the back door he had to go down this long hallway which was lined with dozens of locked rooms.  These were the storage and testing rooms for all their new products.  Only employees with special access were allowed to enter these rooms.  Being a lowly janitor Aaron certainly didn’t have access. Admittedly he did have this curiosity of what could be in these rooms every night as he walked the hallway to the back door.  On this particular night one of these rooms happened to be open.
“Oooh! Whats this? An open room?”  He knew he wasn’t supposed to go in here or see what was in this room but he was all alone, what’s the worst that could happen?  He pushed the door open a took a look around, all that was in this room was a large cylindrical device on a stand sitting in the middle of the room.  In the middle of this cylindrical device was a rubber sleeve going through the entire device.  It was a breeding mount, a device used to collect the semen of animals like horses.  Basically it was a giant fleshlight for animals.  The sight of it sent him into an immediate state of arousal.  “I think I’ll take my break now!” he said as he dropped the trash he was carrying and quickly ran over to it unbuttoning his pants in the process.  There was a problem.  He was only at eye level with the sleeve. He ran to his broom closet and grabbed a stool and ran back placing it down in front of the mount.  He then stripped down naked and stood on the stool now fully erect.  He then inserted himself into the mount.  He paused for a second as this sent shivers through his entire body.  It felt incredible.  Once he regained his composure some he began to thrust in and out.
He was in a state of pure bliss.  This felt better than any sex toy he had ever used.  His whole body was numb with pleasure.  “Oh god this feels incredible!”  His tail began twitching, and changing.  His squirrel tail began to uncoil as its fur grew out in length and changed color to match his hair color.  His new horse tail began excitedly swishing from side to side.  Aaron didn’t notice any of this happening.  He was too busy pleasuring himself.  
“It feels like its getting even tighter!”  The mount now felt even more incredible.  He assumed it felt tighter because his dick felt like it was getting harder as he felt better than he ever had masturbating.  But he couldn’t see what was actually going on inside the mount.  As he was thrusting his penis had begun to change.  It grew longer and thicker.  It kept growing and morphing until it was a massive horse cock.  Since this mount was designed specifically for horses it made it feel even better.
He was gripping the mount with his hands but as his mind became cloudier he slowly let go as natural movements began taking hold.  His fingers hardened and merged, becoming horse hooves.  His body began growing and shifting.  He felt a stiffness in his back followed by an audible crack as his body grew in length.  He finally came to his senses some as he could feel something was wrong.
“Wait, am I taller?”  He then looked down to see that his hands had become hooves.  “AH! What's happening!?”  His body was still moving on its own.  His new horse body thrusting in and out. “I have to stop but this feels too good.” His toes merged as his paws became hooves.  He kicked the stool out from under him as he no longer needed it.
His ears twitched, then transformed from squirrel ears to horse ears.  His neck began to stretch out and grow girthier.  His thrusts began to pick up speed. “HNNG! So close!”  He could feel himself nearing orgasm. His hair began growing longer and began spreading down his neck.  He now had a lush mane.
His buck teeth began to shrink back into his mouth as his nose began to expand.  His face was also starting to push outward. “HHNGH!” He was at the edge of orgasming.  His face rapidly pushed out sending his glasses flying off his face. He could feel a pre orgasmic moan escaping his mouth. “N…Neigh!!” With his face changing he had lost the ability to speak, only whines and neighs would now come out of his mouth. “Gnngh!!”  Here it was.
“NEIGH!!!” He finally came.  It was the most explosive orgasm he had ever felt.  Massive streams of cum came shooting out of the other end of the mount spilling all over the floor.  He was so overcome that he immediately fell to the floor and passed out sleeping peacefully.
He woke up the next morning still inside the room.  He had transformed back into his normal squirrel self.  The room had been cleaned and his clothes were neatly folded next to him.  He quickly got dressed and poked his head outside the room, Only to see his supervisor there waiting on him.  He brought Aaron to his office and chewed him out for what he had done and promptly fired him.  Now  he needed to find a new job.  He also planned on buying one of those mounts once they were available on the market.