You aren't sure what to do now, but you decide that changing back right now wouldn't really make that much of a difference.
The Plan itself is still solid. You will only have to pretend to be the Bull for a few more Days,
at most a Week, and the newly added Duty of having sex with the former Bull isn't that bad, you did enjoy the first time after all.
In fact, this turn of Events might work out for you. You spend a few Minutes sorting your Thoughts and come up with a new Plan.
All you have to do, is to wait for the next few Days, do whatever the Cow wants and transform her to look like you once the time is up.
She will then take you with her back to the Castle, where you can swap with her at any time, by making her believe that she WANTS
you to take her place and turn into your Pet. That way you'll get a Double that firmely believes herself to be the Queen and you her Pet, wich will be usefull if you ever need one. She wouldn't even show any Signs of lying or hiding anything if she was tested with magic. And you can't deny that the Thought of keeping her... arouses you. The former Bull, wether male or female, would make for both a good Pet and a good Lover. She has proven that she can satisfy you, why waste that?
You could even transform her into something humanoid, to set your mind to rest on the whole issue of her being an Animal.
With your Plan completed, you turn you attention back to your current Situation and realize, that the only thing you can really do for now is sleep. You lie down on the Ground a quickly fall asleep.