Oh, I loved this! I'd say you managed to hit my kinks perfectly!
"You're labouring under a set of delusions almost half as pathetic as you are, you insipid, ill-mannered, empty-headed brat. I'd bed a cockroach before I would even look at you, you slimy, artful little monster."
That's exactly what I love, especially when you can see that all Severus really wants to do is throw him to the floor and completely ravish him! And poor Harry, so bewildered and hurt when Severus didn't want him to sit next to him at the head table!
I loved Harry's accent - he was completely adorable here!