It's a Clace wedding! This is a one-shot... possibly a two-shot... it depends on you people. This would be after everything (after the Dark war) and Clary is 20 and Jace is 21. I hope you read and enjoy!
Jace lost sight of Clary, she had disappeared behind Ahriman attacking him there. He swung his sword in an arch towards Ahriman's chest but he blocked it with his own sword. The two blades clang together and Ahriman lost his footing, taking advantage of his mistake, Jace thrust his sword forward, sinking it into flesh. Ahriman was not on the end of his sword however, it was Clary.