Snape and Draco

(I realise my icon has nothing to do with this post, but it's new and I want to show it off.)

Quick question: In canon -- book canon -- does Snape actually favour Draco? I know he favours the Slytherins generally, but is there some actual connection between Snape and Draco? I can't for the life of me manage to filter that out from all the fanon in my brain.

If he *does* favour him, why? Does he like Draco? If so, why? Draco's sycophantic ways?

Hmm. Draco's not the most likeable kid, really.