1). Crossover with Supernatural:: Harry was exiled from the UK. He took up residence in the USA and became a Hunter..... and somehow finds Severus Snape hiding in South Dakota with his Uncle Bobby Singer... Throw in a few zombies... and we're good... OR Severus could be a vessel for an Angel...
2). A snarry based on the movie Bodyguard... Harry is the pop star with his adopted son Teddy and Severus Snape is the Bodyguard...
3). "We love because it's the only true adventure." -Nikki Giovanni