Initials of Fate

Harry is in his sixth year at Hogwarts. Christmas is fast approaching and he is in anything but a 'festive' mood. He is wracked with grief and blaming himself over Sirius' untimely 'death' while taking his anger out on everyone else. However, one night he stumbles across some peculiar initials carved into his bedpost that read: J.P. + S.B. ... just a coincidence? Or is there more to it?

Harry continues to brew in his own misery over Sirius' death and his row with Lupin, all the while continuing to pontificate over the initials of J.P. and S.B. engraved onto his bed post. As he delves deeper into his grief, something peculiar starts to happen.