Sounds like you need to put rat traps in your bookcase...
I don't loan books, bad things happen if I do- like floods, being kicked out of homes, etc.-
I just give lots of books as presents & warn my friends that there's a curse if they borrow books from my collection...
I have books in cases, books in crates, books in the bathroom, books in the kitchen, books on top of the copier, books in random stacks on furniture-
there may even be some hiding in the beanbag, haven't looked in a while...
You can stack them both vertically & horizontally in cases to maximize your space, you'll eventually realize that you live in a book warehouse...
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