Harry Potter And The Language Of Serpents (The Problem Universe #2)

Harry Potter, recent vanquisher of the Dark Lord and potions apprentice to one Severus Snape, is absolutely certain he is going to have a peaceful year learning the secrets of the most elegant magical art. The mysterious baby girl Snape declared his daughter after the Battle of Hogwarts can't possibly cause any trouble, surely? She's a baby. Babies are easy.