Once Upon a time there was a girl named Hazel Grace who was in love Jace Herondale. Jace Herondale, though, was in love with Katniss Everdeen. They went to the Hunger Games together where Katniss's boyfriend, Augustus Waters, died of cancer. Katniss didn't like Jace, so when Jace admitted his feelings for her. She left to another man, Simon Lewis. 

Simon Lewis though, was in love with Willow Glasspiers. He traveled to the UnderWorld with her as a couple, but then Willow met Michael Midnight and ditched Simon. Simon was sad and went to Gale Hawthorne for relationship advice. Gale said: "As long as you have both your legs, you're better off than Peeta or Augustus." Simon didn't know how this had to do with anything he had just said, but he let it go and started dating Isabelle Lightwood. 

But Isabelle Ligthwood already had a lover, Finnick Odair. Finnick Odair, though, decided that Simon and Isabelle were too perfect so he left Isabelle for Alicia Hazer where they lived happily ever after. 

Back to Hazel Grace, Hazel was sad because Jace didn't love her, so she went with Percy Jackson, and Percy took very good care of her. But, too love Hazel meant he had to leave Annabeth. 

Annabeth was angry so she killed Ginny and took Harry Potter for herself.

In the end, the people who didn't have lovers anymore were dead and the people who did were happy ;)

CAST OF THAT STORY
Hazel Grace and Augustus Water: The Fault in Our Stars
Jace Herondale, Simon Lewis, and Isabelle Lightwood: The Mortal Instruments
Willow Glasspiers, Michael Midnight, and Alicia Hazer: Willow's Legend by @IonaBaird123 
Annabeth and Percy Jackson: Percy Jackson
Peeta, Gale, Finnick and Katniss: The Hunger Games
Ginny and Harry Potter: Harry Potter