While you were still on the phone with "Prancer" you watched as your own hands begin to match your legs, while your fingernails darken to the point where you couldn't see the fingers they were no longer on. You could also see the fingers fuse while fur sprouts on your arms, leaving you with a second pair of hooves.
Your shirt, and coat vanished, while your face stretched a bit to the point where it became some kind of reindeer muzzle, while your nose changed, and your eyes moved to opposite sides, while your ears extended, and more fur sprouted on your body. Then, just before your antlers sprouted from the top of your head, you noticed your privates. Your penis was about to change next, just as a harness extended from the jingle bells around your neck as you laid there on your back.