You turned your GF into a cow

As you come home you start to hear her voice, or rather her mooing.

" Nina... Nina needs yoooooou Mooooooooooooo " she desperatly pleas

You came a bit later than usual and you realise that it might me the reason she seems to be so impatient.

" Nina needs to be miiiiilked, please, please , please, hahn, hahn ,hahn " she pauses with a muffled moan

You walk up to the barn and open then doors. The frown of frustation on the face of Nina disappears as you enter. She struts toward you in her revealing cow suit. The tinkle of the cowbell hanging from her neck accompanying her every step. The bouncing of her ample chest and generous bum mezmerizing you as always. She playfully jumps on you as a strong smell of milk enters your nostrils. She does a little dance against you, smiling and shaking like a very happy dog would welcome you. She starts to rub herself against you, not resisting anymore her primal urges. You can feel her juices instantly humidifying the left leg of your jeans. She takes a few step back as you look at her with a reprimanding stare. She pouts with an admission of culpability

" Sowwy master, Nina just, just... Nina just can't wait anymore"

She plants her two deep blue eyes in yours and presents her two very heavy breast.

" Nina begs you to... To... " she searches for the right word " To re - lea - se her , yes, yees ! To release her " she exclaims happy to put in word what she feels in her now stupid mind.

Nina wasn't always like this, she used to be a very smart young women but as you kept milking her she kept getting more and more stupid. Now she's not much more than a human cow. But, Gods, it's impossible to resist to those breasts...

Maybe you should try to reverse the process ? Or maybe you should just use her as you see fit...