What a creative twist on canon and gender-bending! As many have said before me, it leaves open so much food for thought regarding how this would play out - Molly would be sure to note the differences in her only daughter, and Harry has gained more of a kindred spirit in Severus than he would ever have had in Ginny. It's such a Slytherin response for Severus to go with the flow and take advantage of the opportunity that was thrust upon him. It does make me cackle a bit at the thought of Severus enduring Weasley get-togethers. Great imagination, and an intriguingly believable modification of canon - nicely done!