All I Want For Christmas Is...Not You by jennastromberg
Three simple words. "Want to bet?" Anna Sommers takes a bet with Wesley Stromberg, a guy she can't stand. Hasn't been able to for eighteen years. Anna has to resist Wes's charm for a whole month to win the bet, but Wes has a few tricks up his sleeves. He doesn't take no for an answer, and Anna doesn't like to give yes for an answer. Who do you think will win? Who do you think will lose? Not only will they lose the bet, but they could possibly lose a lot more.