Where would fanfiction be without hurt/comfort? It's a staple for many of us. If you want a satisfying emotional roller coaster ride, with comfort at the end of the journey, here's your list:
Shattered (link is to warnings page. Click on "fanfiction" and then find title on list of her Harry Potter stories. This claims to be a rough draft, but is wonderful as is). In order to save Harry's life, Snape must create a bond between them. But can Harry learn to live with that?