Midnight conversation under the planet Venus

Post War, Non Epilogue Compliant. Even years after the battle against Voldemort, Harry still has trouble sleeping. So the new DADA professor finds himself wandering the lonely stone halls at night. During one of his midnight strolls, he bumps into the only other night owl at Hogwarts, Aurora Sinistra, the Astronomy professor. Taking a chance, they strike up a conversation.