A roaring fire, an open box of chocolates, and a good book are essential to a proper February 14. A fun literary cocktail doesn’t hurt, either…. Ah, the upside of the adult Valentine’s Day. The downside? No fun Valentines from classmates! If you’re missing Cupid’s calling cards, we have a literary treat for you: Here are the cards we’d like to think our favorite authors and characters would send out this Valentine’s Day.