Looking for a Cat Girl

So basically you were originally just a cat, or so I thought. I am 25 and you have been my companion since a week after I was born, but despite being really old for a house cat you still have the longevity and youth of a kitten. When I was twelve, I rescued you from a fire. I have always been a good owner, feeding you treats, taking care of you when you're sick, accepting snuggles and even playing when I am not in the mood because I get cats and I like them. You can turn into a human though, and you can also turn into fire-breathing lion. So what will happen when a bunch of thugs try to mug me and beat me with a baton?