Alright, so I've been neck-deep in 'House of the Dragon' fics for a while now, and the Jon Snow/Rhaenyra Targaryen pairing always felt like a natural fit the show itself didn't deliver. It's that 'what if' that just clicks. If you want the heavy-hitters, you can't miss 'The Ice Dragon' over on AO3. It's a massive time-travel epic where Jon goes back to the Dance era. The author gets the political maneuvering so right, and the slow-burn between him and Rhaenyra is agonizing in the best way. The character voices are spot-on—Jon's world-weariness against Rhaenyra's fiery, desperate determination. It's long, but you get completely lost in it.
A shorter but brilliantly executed one is 'Of Fire and Blood.' This one goes the soulmate mark route, but it's not cheesy at all. The premise is that their marks only appear when one of them is in mortal danger. So you get these intense, life-saving connections across time that build this profound bond before they even meet. The writing is gorgeous, very introspective. I reread it whenever I need a hit of that tragic, destined romance vibe.