Of course! You’re probably talking about Ardent. That’s the ao3 link, but here’s the FF.net one as well. Monochromatic (x) is also sort of a soulmate AU, though it’s not very long (2.8k). And I’m Going Under is intended to eventually be a soulmate AU if I ever get around to updating it. That’s about it in soulmate AUs for the shadowhunters/malec fandom at least. I hope this helped!