19(Shadowhunters)

An Au where people are born with their soulmate's name in their wrist, black means they are alive and red or other colour means they are dead.

Alec Lightwood and Andrew Underhill were born with their soulmark being the colour normally attributed to a dead soulmate which wasn't that surprising seeing that shadowhunters died early but the names in their wrists could never be found in any archive with all shadowhunters names.

With years passing, they got used to living knowing that unlike others they would never be able to live a romance with their soulmate but that changed when Clary appeared and Magnus got involved.

The night when Magnus cured Luke, Alec was looking around the photos and all that in Magnus loft when he came upon a certificate attributed to two people and the names were familiar to him as one rested in his wrist and another in a shadowhunter's under his command.

Said names were Nafis Al-Amri and Teresa Aragones, the ones belonging to his and Andrew's soulmates which are dead but it seemed like Magnus might have known them.

When Magnus reappeared, Alec didn't immediately ask him about them but as they drank, he ended up asking about where Magnus knew those two and why he had a certificate with those names which made Magnus freeze.

Magnus didn't answer and Alec almost thought he asked something that hurt him until Magnus asked him why he wanted to know and while Alec was told to never reveal his wrist to others, he trusted Magnus and told him that one of those names was in his wrist and the other was on a shadowhunter under his command which made Magnus sighs before telling Alec to call the other shadowhunter before leaving to do something.

Alec was confused but did as Magnus said and later into the night, Alec Lightwood and Andrew Underhill found the truth behind their 'dead' soulmates as they heard the story of how Magnus Bane and Lorenzo Rey came to exist(yes, they would be friends here because I think their dynamic would be funny).

How anything would go or affect canon is up to the writer.