Magical Christmas Diaper

While opening my gifts from Santa I discover something strange. One of the gifts has a pullup, and a diaper!? Why would Santa give me these? Suddenly I'm wearing the diaper, and very confused. My t-shirt changes into a onesie. A pacifier appears in my mouth. Initially I struggle against the change and pout. Soon I give in, wet my diaper, hump my Grinch plushie, and use my vibrator.