You're an average teen in a mixed high school. One day during gym a basketball throw goes wild and a hellhound schoolmate goes running after it, as do you (since you're closer to where the ball is headed). The ball flies into the street, with the hellhound fixated on it - and not seeing the truck barreling down the street towards her. Without a thought you charge faster, grabbing her and jumping out of the way, saving you both but getting a broken leg in the process.
(Good job, hero!)
This is where things start getting weird... It's well known how ferocious hellhounds are, but she acts more like an orc who's had her ass kicked. Her tail wags excitedly whenever she sees you. She nuzzles you affectionately whenever she can. She carries your books and brings you lunch. In every way, she acts like a happy puppy when she's with you. Heck, her favorite thing is to lay naked across your lap so you can give her tummy rubs!
Something is clearly going on here, though WHAT it is you can't quite figure out. Is she genuinely feeling this affectionate, did someone else influence her feelings towards you, or is there something else going on?
WWYD?