You begin to concentrate on the first animal that pops into your mind: A Clydesdale pony. After a few moments, you begin to feel it. You crotch began to bulge out, stretching tour boxers, before your growing cock broke free. The base of your spine began to push out, forming a tail, and the remains of your boxers fall to the floor. You bite your lip in anticipation as you began to grow taller, staring down at your growing cock. What was once eight inches in length and three and a half inches in diameter was now nearly fourteen inches and as thick around as a coke can. Your face begins to push out, and you moan in pain in pleasure, and your now furry hands wrap around tour continuously engorging length, stroking its sensitve skin slowly. It caused you to shiver, and soon your changes began to make you more horse than human. You were nearly eight feet tall, your cock was nearly two feet long. Your balls were the size of softballs, your feet were now cloven hooves. Your face and head was eguine, and you were covered in a layer of shaggy brown fur. You stroke your cock some more, trying to draw a release, before you hear your door.