Oh, thank you so much for the wonderful feedback. Dialogue is my favorite thing to write, so I'm very glad to hear it worked for you. :) And I definitely take it as a compliment that you're also not a bottom!Snape nor Snape/Neville fan and still enjoyed this--makes me feel like I've accomplished something. :D
Since you may have been converted to the possibility of the pairing, you might want to give this wonderful fic a read: http://archiveofourown.org/works/601869