The Cutie Mark Crusaders are given an assignment in school that requires them to ask the Mane Six about facts of nature. The answers about "the birds and the bees" they get should make for a very interesting report!
Twilight Sparkle: librarian by day, monster hunter by night, and irredeemable cynic all throughout. Vampires? Simple. Zombies? Easy. Pretending not to see them every night? Now that is a challenge...