This was the first fic: soulmates AU and iirc you got two names written on you, one was your soulmate and the other was like your nemesis, but you didn't know who was who, and Harry had both Draco and Tom riddles names, I remember there was also a tag for Harry Potter/Tom Riddle romance in it too, but endgame Drarry

Thanks for your help!

We believe you’re looking for Never Enough ('Cause the World Won't Understand) by @intheshadowsofao3 (125k, E)