What do I do?

My little boy is 2 and a half, he's been completely dry and clean for 6 days, doing all of his business in the potty, telling me when he needs the potty etc. I have been inside for the 6 days just letting him run nappy free, I've tried putting him in pants because he absolutely does not want to be in a nappy but he can't hold his pee until I've pulled his trousers and pants down, what do I do? I don't want to just put him in a nappy whenever he goes to nursery because that's going to be so confusing for him!