Why does only one nipple exist?

Maybe she's mastered the ancient art of erecting one nipple xP ?

>_> that's normal, girls can totally have only one nipple at the time

soltyrei said:
Why does only one nipple exist?

Why is this the subject of an amazingly delicious picture such as this? :V

Is she releasing a 'mon from the master ball, or did somebody just capture her and the beam is about to suck her in?