Your small table was surrounded and stacked with books. A long line of people impatiently waiting to get your erotica book signed

Your hands were on autopilot, signing book after book, one after another. Before a man with white hair and a black mask stepped forward. He firmly placed the book down, staring down at you with flushed cheeks. “I—Uhh…the books really good?” he muffled out awkwardly. The book sat spread open in front of you. There was a stain..What had this man done with the book?