Prompt: After years of neglect, the wards at Grimmauld place are starting to fail. Which would expose the house to the neighbors. Harry has to hire both construction workers and needs help from Goblins/Dept of Mysteries to deal with the stubborn Fidelus charm Dumbledore placed. Enter Severus to help with Albus' charm.
Suggested Characters/Pairings: Harry/Severus
Theme/Tone: getting together, first time, romance, working together
Additional Info: you can save or demolish the house; no unhappy ending, please