Is it possible to COMPLETELY delete a Book from my purchased books? Yesterday, I saw that my brother has downloaded an "hentai" on my Mac (shame on me, I didn't lock it !) I deleted it, but it stays on my purchased books, and I don't want it !

Is it possible to totally remove a book from my account's purchased history?
This has since moved from iTunes to within the iBooks app, but the procedure is exactly the same:


Open iBooks
Click iBooks Store in top-left corner
Click Purchased
Click the x in the top-left corner of the book you want to hide


And to unhide:


Open iBooks
Click iBooks Store in top-left corner
Click Account
Click Manage next to Hidden Purchases
Click Unhide below book in question