"Well, I would be strong of body, solid of brute muscles, a true male among males, the leader of the herd, my horns tell of my honor, and I stand upon a hill overlooking a herd of a thousand horny cows!" said Terry with a laugh.
Almost as his laugh died off the things which make a bull, a BULL, began to consume Terry.
He grabbed for his gut and hunching over moaned as his penis burrowed under his skin and popped out just below his navel. His testicles took to growing, inflating, and gaining such weight and size they hung low.
His head started to ache, he felt two knot like lumps with stiff feeling hands and fingers. His eye crossed for a moment as the bridge of his human nose flarred wider and longer to make a muzzle for one big bullish head.
All this and yet more as he stood up and felt his ribs expand and backbone grow. He jerked and twisted as the massive spurt of growth raked his body, his legs, and arms.
Moaning slowly changed to the mornful sound of a bovine beast in pain. As with each cry Terry's voice changed till on the thirteenth cry it flipped over and was the true sound of a horny bull Mooing for his mate.
Hannah started laughing see Terry the slender jerk kid he was becoming this massive monster of moaning muscles and cloven hooves.