You look to the fairy, who still has that impossibly smug grin on her face, and you pretend you don't care. Instead, you grin back and look at her as if she was the most ridiculous thing ever. Well, you try to grin, as your face muscles are truly very different from what they were not even five minutes ago. You decide to answer her smug insolence by a bigger insolence and ultimate scorn. And in case your grin just makes you look freakish and quite ridiculous, you snort loudly, toss your head and mane, and shake your tail in contempt and if it's not clear enough, you decide go all the way. It'll be most puerile, true, but most satisfying as well. You turn around, show her your new horse ass, then raise your tail and push, releasing an enormous smelly flatulence. The fairy gets out of the way, pinching her nose, but she obviously got the worst of it. She screeches in pure horror and disgust, getting higher to purer air to breathe as fast as she can. You laugh in loud neighs, delighted at your crass prank. Oh, it hardly befits a unicorn, truly, but you do not care. After all, you are no unicorn to start with, so why should it be important to you how to act like one? This stupid fairy got her due and it was hilarious! She is so furious herb face is red and wears a deep frown. She got down a peg or two and it feels great for you!
"Oh, you think you can still be insolent and disgusting with me? You think you can humiliate me as a unicorn?" she says angrily. "Well, YOU deserve to be punished even more! Maybe THEN you'll start acting with more class!"
She blasts her darn fairy dust at you and you do start to worry and wonder what awful appearance you're going to get and if being a vile unicorn was really such a good idea...