Brain Guzzlers from Beyond! (Steph Cherrywell)
"You are Bonnie Noodleman, Ordinary Well-Adjusted Teen-Ager, on an ordinary well-adjusted drive up Make-Out Mountain--until some gooey monstrosity from beyond the stars guzzles your boyfriend's brains clean out of his head! Jeepers, what a pickle! Can you convince the townsfolk you're not koo-koo, or is your thinker next on the alien menu?" - Author's description