Searching for Neville's Toad
Daddy by bouncingblondeferret-
Ron/Hermione, 13 chapters, but really well written and has funny and sad parts; first fanfiction I read, and got me hooked!
Trickster by Willow Rosenberg-
James/Lily, 16 chapters and a sequel in the works! Also has funny parts, and takes a while to really heat up.