1. It's time for the Minister of Magic to step down, and everybody assumes Harry is going to take over, including Harry. But then Severus challenges him. It's the campaign of the century, and all that adrenaline has to get released somewhere...
2. A former Death Eater's estate is going up for auction. Severus and Harry get into a bidding war over a particular item. What's that item, and why is it so important to each of them? And, more importantly, to just what lengths will one go to ensure he's the one who ends up with it in his possession?
3. Harry never mastered the art of using the Floo, and one day ends up in Snape's fireplace. He hasn't seen the man in years, not since he thought he was killed, but something about the experience compels him to stick around.