Juniper and Thorn by Ava Reid

When a story is dark and it's pretty, but because it's dark you're afraid the ending is going to be dark.
Must protect my boy. And my girl, the youngest child.
Sevas is cool. I love him. Like... He's a dancer and he is adorbs.
lol I should have guessed the monster, but I didn't.
The entire like....last few chapters and Sevas and Marlinchen and fjkldsjklsfdfsdsjkl:

320 Pages