Duude, so ..believable.. I'm.. just.. madly in love with how you draw them. It's so perfect and messy, and expressional. <3 Normally, I'd find Butters tappin' dat ass (XD) totally out-of-character. But, the facial expressions (and probably the body language too) just made it look totally possible (and in-character) to me. GOD DAMMIT. Your art is so great.