You look at your ex-girlfriend and smirk. "This here is a genie and your gonna get what you deserve! Genie, I wish that she will be turned into the cow she is. But I want her to very docile and only a two feet tall."
Your girlfriend looks at you in shock, then looks at the genie as he raises his arms, waves and an aura surrounds her.
You watch in delight as she begins to shrink! She falls onto the floor, struggling in her bigger clothes. "Wha..what's happening to, meoooo?" She starts to panic, but you hold her and remove her too big clothes.
Your girlfriend keeps changing. Her shrinking seems to have subsided, but her body is far from finished. Her legs shorten and thin out, her skin grows a bristly fur and turns white with black spots. You watch as her breasts shrink into her body and her udder grows between her legs. You feels a bulge in your own pants as your watch the udder swell and grow with milk. A tail pushes out, making your cow-girlfriend moo is semi-discomfort. Her face pushes out and her nose expands.
Then, seemingly quickly, your former girlfriend is transformed into a small cow. You smirk down at her. "Now this is much better!" You sit down next to the cow and pet her back. You laugh as she seems quite content, her tail swishing and her letting out moos on occasion.
The next thing that happened was...