Piper is a Ghosthunter, seeking to avenge her parents' death by the hand of a powerful spirit.

"So, I know Mr. Shurley said this was for English," Dean spoke, making Castiel's stomach flutter. How could a voice do that? He thought. "But I was going to ask you to- uh-" he rummaged in his backpack and took out a crumbled piece of paper. "Do you take Latin? And I also need help with Math." Castiel squinted his eyes, thinking for a moment. "You take Latin?" He sounded impressed and surprised. (Cover by @lineart {from tumblr} not mine)