One - in which Simon sings one last song (AU)

Basically what the title says, but every chapter has a song that has sparked an idea in my chaotic mind. The lyrics are combined into the stories, but I suggest you listen to them for maximum effect as well. At the end of each title, in brackets, will be an indication as to in what world the story takes place. SH for Shadowhunter world and AU for Alternative Universe. Enjoy :)

PS. I do not own the characters, that's all the wonderful Cassandra Clare.