I really liked this, Beth. Don't think I've ever read a story quite like it. It was like two parallel universes of frustration, Snape in his hospital bed, Harry burning out in the RoR. I was wondering how you'd bring the two of them together, then AHA!
That was genius. It reminded me of an episode of The Twilight Zone I saw when I was a kid, where a child fell out of bed during the night, then accidentally rolled under it into a parallel dimension (for a long time, I'd stand at my bedroom door, then take a running leap for the bed).
The wardrobe! I had to snicker at that paragraph that began, It would have made for a more dramatic ending if Tom Riddle had intercepted Snape and Harry... Hee! It would've made for more frustration, and a longer story, for sure, but I'm so glad you gave them an easy passage. Nice touch, that. And I liked how you ended it all--Snape giving Harry a chance to really think about things, then giving him a 'taste' to help the decision-making process. :)