You grab the young man in your powerful arms and pull him back from the door. He shouts and struggles to break free, but your bullish muscles are too strong. Miranda moos in delight seeing you return, and rpesents herself to you.
"Let me go!" The young man struggles wildly, unable to get away. You hold him with one arm and rip his clothes off effortlessly with the other. Now he is really afraid. "No! Please!" His struggles are getting you very aroused now, and the head of your bovine penis begins to push up between his legs.
Using both arms, you force the young man onto your penis, pushing into him with a powerful thrust that makes him scream. Further in, deeper and deeper, until his butt is pressed hard against your thighs and your penis must be halfway up his chest!
You get a very powerful sexual sensation, but it is different than anything you have experienced before. Like an ejaculation, except that the liquid spurts into you, not out! You gasp and the young man whimpers, feeling jet after jet of hot cum pumping into your balls. After a minute, you realize that the young man appears MUCH younger than he did before. Barely in his teens now, he loses months of age with each powerful spurt of liquid.
You feel your testicles swinging heavy between your legs, and realize that they are hanging below your knees! As the young man shrinks to a teen, then a boy, you can make out the huge, black basketballs that keep getting larger as the boy becomes 7, then 6.
His arms and legs draw in, and his cries stop and a dazed look replaces the fear. Five, then 4. No arms or legs remain, and his head is starting to sink into his shoulders. Three, and his face is smoothing out, eyes and nose and mouht all closing up.
You shudder violently as a massive pumping sucks the rest of him into your bull's dick. Beach-ball sized testicles hang to the floor between your legs, and you cannot walk. The young man has become semen - bull's semen.
Luckily, Mirnada is more than happy to come to you, and almost before you realize it, she lifts up and slides her hot, slick cow cunt around your fully bovine shaft. This time, you start pumping out, feeling your own body change as you turn more bullish. Your balls shrink as Miranda's belly swells out, and when you finally ejactualte the last of the young man into her, you are normal - for a black bull.
Miranda moos and rubs her belly, which now looks like she is very pregnant. The young man has become an unboarn calf!