You walk to the next mirror and pose in it. It appears to be a normal mirror when you start to feel an odd buzzing on your rear at the cleft of your butt. The buzz moves up into the base of your spine. You then feel a pulling at the spot. As the pulling continues, you see the back of your pants bulge outward. You aren't sure what's going on now as you feel like the base of your spine is pushing on the inside of your pants and boxers. Soon the back of your pants stretch becoming very tight. The tightness makes you want to bend over a bit.