The Guardians Lost Hostage (Jelsa)

Elsa, Anna, Merida, Rapunzel and Gogo are best friends in Middle School. But one day after Music class, Astrid, Toothiana, and Honey Lemon all of a sudden started to hang out with them. They felt pretty uncomfortable, but then they just thought that they were trying to be friendly. But well.. They were wrong.
Time past..
They were now in High School. There was a party mentioned and all agreed to go. Going up the North Mountain, their car broke down. They got out of the car and found themselves in the middle of no where. They all decided to search for help. So they all decided to split up.. Bad mistake.
Elsa was walking in the Mountains, in the dark night. She then startled when she heard Gogo's scream.. then Rapunzel's... then Anna's... then Merida's.. it was completly silent for a while and that's when it hit her. She was the next one to be screaming. All she remembered was a boy in a blue hoodie was a strange type of stick until she was knocked out.
When she woke up, she found herself chained up in a room. And then.. the boy in the blue hoodie walked into the room.
But why? Why did they also get her friends? What do they want from them? Do they want money? Attention? Or.. Power..? What will happen to them?
( Warning: There may be sexual themes in further chapters. )