Thank you! Of course I knew that Snape was faking the amnesia as I was writing this fic, and I threw a lot of hints in, so I'd hoped it wasn't too obvious to the reader! I'm also glad the "Mr. Potter" had the desired effect.
Well, it didn't have to work out, but I'm a sucker for giving them a (reasonably) happy ending. ;)
(And apologies for the latest reply ever! ::facepalm::)