A New Severus Snape (гет)

During the Battle of Hogwarts, Voldemort casts a de-aging curse at Harry. His intention is to return Harry to his infancy, to the age when he survived the killing curse, and make that Avada Kedavra stick this time around. Snape gets in the way of the curse, though, which de-ages him seventeen years. Voldemort is eventually defeated, but Snape is stuck at age twenty. When Hermione and her friends come back to school in the fall to start their seventh year, they're surprised to find that Snape is still de-aged and still stuck at Hogwarts trying to find a cure.