You've worked fast since you were thinking about it. Oh please do show us a picture of your WIP!
If you are thinking he is suspicious, is it a sign you are cleaning thngs up more than normal for him to wonder why the neat-freak? Maybe he's keeping an eye on the scrap bin or garbage and it's emptyness seems odd?
Leave those Harry Potter books lying around, as you'd normally leave a book between reads. Just make sure you change the page marker, and read a page or two at that point each time, so you can say to him, oh I was reading the part about, do you remember that? :)
And be careful of his run times .... in case he returns early!
Maybe do some Mug Rugs, to have in stages and leave out as decoys?
And remember ... some pics for us to ogle on!