During a school wide Secret Santa, Roseanne has the bad luck of picking Jennie Kim, suspected Death Eater. When she tries to sneakily learn her secrets in order to get the Slytherin's gift, and Jennie winds up trapped under some mistletoe, things get out of hand. Who said snogging a Death Eater wouldn't land Roseanne in a strangely addictive mess? Adapted Fic Hogwarts AU