The feeling of pressure in your rear increases as does the rip in your pants. Your hands cup a large and swelling lump of warm flesh. Soon, it's almost a foot long. The base thickens and slowly tapers off into a rounded end. You twist your body to see your new appendage. You've already accepted that you've grown a tail, but as you glimpse it for the first time, you startle.
While you do indeed have a tail, vaguely dinosaur-like, it's the color that captures your attention. It's royal purple everywhere except on the bottom which is a soft pink.
Then...