“We need to make sure your stallionhood is clean and functioning properly.” The doctor said, reaching for a pair of thick rubber gloves on his desk.
“Clean? What?” Lily questioned.
“Yes, your sheath. Lots of dead skin, dirt, and bacteria will collect in there, so I need to make sure it’s clean. I’ll do it this once, but from here on out, you need to make sure that you keep your penis clean.” The doctor explained, as he rolled over to Lily in his chair.
Lily’s face turned a deep red color at the idea. Of course being the equestrian she was for all these years, she knew what sheath cleaning was, but to be the one getting cleaned instead of the one doing the cleaning really struck a nerve with her.
“Alright, let’s see here.” The doctor said, grabbing Lily’s thick rubbery sheath and spreading it open.
Lily watched as the doctor dug and felt around inside of her swollen equine sheath. The sensation was unpleasant, but also tickled. Lily had to strongly fight the urge to start kicking about, now that the drugs were starting to wear off and she had gained more and more feeling in her new, modified lower half.
The doctor pulled out a few wads of dead skin mixed with dirt and crud, flinging them aside into his garbage bin. After a minute or two, which felt like forever, the cleaning was done.
“There! Not too bad! Just make sure you keep it clean!” The doctor said with a smile, stripping his gloves off, discarding those into the trash as well. “Now, for the first test.”
“First test?” Asked Lily.
“Yes, I’m going to preform a few tests to make sure I didn’t miss anything before I send you on your way.” He explained.
“Send me on my way?! Like this?!” Lily screamed.
“Darling, calm down. We’ll cross that road when we get there. Now, about that test.” He said, jotting a few notes before sliding a pair of glasses down off his head onto the bridge of his nose.
The doctor reached towards Lily’s crotch again, this time, he gently tickled her large horse testicles. This caused Lily to jolt and shake. Her large horse legs flexed and tensed as she felt a terribly new and strange feeling in her sheath. Lily could also feel her large horse anus puckering up against the clothed table she sat on. Slowly, her massive horse prick started to swell and grow, sliding up and out of her sheath further and further by the second, until it reached an impressive 20 inches.
“Wow! Quite the big girl! And a girthy one, too!” The doctor said excitedly, jotting a few notes down.
Lily blushed again as her new member stood proud in front of her. It had a mottled pink and black color. It was indeed Champ’s, as she could recall.
“Now darling,” the doctor started, “I want you to do as your brain tells you.”
He held up his pen and notebook, studying Lily immensely, waiting for her next move.