Beyond the Veil by *Avender on deviantART Sirius Black and James Potter reunited again! So Harry saw Kings Cross because that was where he could escape from the normal world to Hogwarts. Sirius escaped from Hogwarts to his friends.
Professors Snape, Dumbledore and Slughorn in the back ground is gold! They may be extremely powerful, wise and all knowing- wizards and yet teenage girl drama fascinates Dumbledore, baffles Snape and terrifies Slughorn.