Let’s assume horse guys would exist. They look like human guys, but have a tail, hoof hands and equine carpal joints on the lower thighs, so it looks like a horse leg under the lower thigh with hooves. Their genitalia also transforms, but they have no sheath. Blaze wants to become a mating horse. They are also taller than humans. Compared to the humans, they don’t need to wear shoes, and mostly run around with only very light clothing or no clothes at all. The name of the horse guy is Blaze and the story is nsfw. He gets checked out by his human trainer while he stands on all fours.

Trainer: How was your transformation?
Blaze: It was amazing, I feel stronger and faster. And my new genitalia fits perfectly with my equine body.

Trainer: Good to know. Let’s check your physique now. Stand up on your hind legs so I can see your muscular development.

Blaze stood up and flexed his muscles, showing off his toned chest and abs. The trainer circled him, inspecting his body closely, feeling the muscles and checking his flexibility.

Trainer: Your physique is impressive, Blaze. I can see that the transformation suits you well. Now let’s check your stamina.

Blaze nodded and lowered himself to all fours, then started trotting around the training field. His hooves made rhythmic sounds on the ground as he picked up speed, his tail swishing behind him. The trainer watched closely, timing his laps and observing his breathing.

Trainer: Excellent, your endurance has improved a lot. I think you’re ready for the mating season.

Blaze: What is the size of my dick and my balls? Can you compare them to objects?