Siren Song

Hermione Granger has come of age early and she changes. Albus notices. He decides to meddle, he sends Severus to Grimmauld over the summer to keep an eye on her. He claims he thinks Hermione is hiding something from them. Over the summer, Hermione and Severus become friends, then later more than that. It begins during summer going in to 6th year, and involves use of a time turner.