Recommend story: The Disappearances of Draco Malfoy
I just reread The Disappearances of Draco Malfoy, which is a Deathly Hallows rewrite that fits the books very well both in tone and plot. The premise is what could have happened if Draco had time to accept Dumbledore’s offer of help at the Astronomy tower at the end of THP.
If you’re never gonna read a Dramione story, you should still consider reading the chapter The Secret-Keeper’s Tale (you don’t need much context), which covers the story arc from Ron leaving the others, until they are rejoined. This has got to be one of the most beautifully written Ron-moments in Harry Potter fan fiction; much better than Ron’s arc in Deathly Hallows.