You open the soda can with a 'Phisss!' and take a swallow. Doesn't taste too bad. Got a nice flavor to it, kind of hot, but fruity. You feel a sudden bulge in your pants. A hand shoots behind you. You've got a small lump on your tail bone. You wait for a few minutes and nothing happens.
You shrug and take another swallow of the soda. The bulge grows bigger! You feel the lump again, it's definitely bigger. It does feel a little like a tail. You smile and figure that it's reacting to the soda.
Taking the can, you start gulping it down. With each drop that makes it down your throat, your dragon tail swells, ripping open your pants. It snakes out, thickening and growing deep purple scales. You finish the soda, and you tail finishes growing. You look back and see you really do have a dragon tail. You can move it around, you figure that it's got to be ten feet long and six inches thick at the base. The underside is a light pink and the rest is dark purple.
You then...