I can imagine interesting ways to get him to squirm. Seeing as he doesn't seem to think of you "that way", I'd be tempted to go to bed in the hottest nightie you can find (or nothing, whichever you think would get his attention more), but act totally normal. I think the circuits in his brain (oh, I might have made a big assumption there...) would overload! Of course if it was me, some nice flannel jammies would do the trick!