I agree to all of this! Look at capitu's Harry/Draco recs on Live Jounral if you haven't. She/he stays abreast of all current ficathons and has new stuff, plus recs by category. Have you ever read the vaguely New Year's Eve Snarry epic "For Auld Lang Syne" where Dumbledore finagles Snape and Harry into a mountain cabin via his will? It turns into a lifelong relationship that endures during Harry's marriage to Ginny (and the kids) and Snape's moving to another continent and having an LTR with an OC. It's here if you haven't, I think it's wonderful:
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https://archiveofourown.org/series/34560