I was going to suggest that Remus might find it advisable to keep a supply of polyjuice on hand that he can swallow quickly in case Narcissa or anyone else dangerous comes calling. However, that wouldn't work very well if Tonks is still in the dark.
On the other hand, that's another strong reason to bring her in.
Re: ORDER ONLY
On the other hand, that's another strong reason to bring her in.