Yes, this does involve Skittles.
Take a package of Skittles. (Not the value bag!) and jam them up your ass. Don't ask me how, because I don't know. I suppose you could either load them in like shells on a pumo-action shotgun, or use a funnel... I don't know and I'm not about to try.
Anyway, once your ass is full of Skittles, you have someone eat your ass.... Then, whenever you feel like it you shout "TASTE THE RAINBOW!!!" and expell the Skittles into the mouth of the person you will never kiss again.
