You're an ex auror, back at Hogwarts to train amongst your old Professors. You may have bitten off more than you can chew as training seems to be the least of your worries; Hogwarts is full of distractions and secrets but it's not just Hogwarts that has secrets. Severus Snape, the Potions Master, is immediately suspicious and keeps a very close eye on you. Your broken past, present and future lives begin to weave together to create something dangerously useful. Severus Snape x reader romance. F/M