The burn/delete if I die

What is the dirtiest, filthiest, smuttiest book that you have read? I mean the book that breaks the spice scale. If you were to die you would want to burn the book/delete it from your device so no one knows you've read it. We all know that reading any kind of romance you are able to keep a straight face during the spice scenes. I'm talking about the book that made you make a face, blush, etc during the scenes. The kind of book that you may only admit to on reddit when there is the "no one knows it's me." Not erotica. The story is still there but when you get to the spice it's like a ghost pepper, a Carolina reaper and pepper x had a three way hate fucking and made this.