I caught him tearing a few pages out of his Gruffalo book this evening, whilst he was sitting on the toilet. I shouted at him and was quite cross as i couldnt believe he would do this. He later confessed he'd done it to another book and showed me the pages hidden under his bed so he must have known it was naughty. He said he was sorry but I'm really annoyed with him and feel he should know better.
What would you do/suitable punishment?