You keep staring at yourself in the mirror, at the fine piece of law enforcement muscle you've become thanks to the enchanted glass. You keep turning and flexing in front of the mirror, enraptured at how sexy you think you look in your uniform. You also realize that your new body is starting to turn you on slightly, your crotch starting to bulge more as its contents begin to stir.
You stay in front of the mirror, fully intending to see just how manly you've become as you pleasure yourself. But as you take another look at the glass, you notice an off detail about your face. Your ears have become slightly pointed and your nose is starting to turn upward a little. But instead of causing you to stop, these details only increase your need for release. You unbutton your shirt and take off your belt. You lower your pants to find that you were only wearing a <Insert hometown name here> Police Department jockstrap under your pants. Your bulge is starting to grow again, and not just from the rush of blood to your groin. Your junk is swelling larger, thicker, longer, and hanging lower. Nothing looks too bestial, but it does look unnaturally large on a human.
All you care is that there is more to stroke now. You watch yourself jack off in the mirror that started this whole thing. You can see your face lengthening into a hoggish snout, tusks rising from your jaw. Your police hat has fallen off to reveal a mane of bristly hair that resembles a mohawk. Shorter, but no less bristly, hair has begun to spread across your body. Your toes quickly and painlessly shirt into porcine hooves and a tail extends out from the base of your spine as you climax.
You collapse onto your semen soaked uniform, seeing a buff, but now very exhausted, boar-man reflected in the mirror.