Stolen by a Superhero

Draco is always enthusiastic to spend the day with his uncle Sev, and he's extra excited when he gets to do so at Hogwarts this week. But only a few hours into the day and the headmaster visited the dungeons, bringing along an extra special "adventure" for the two. Harry Potter had runaway from his home at the Dursely's for the fifth time now, and Albus was starting to get flustered. None of the family service witches had seemed to do any help for little Harry, so Albus decided to send Severus this time. The only problem is that Harry's situation is much worse than Severus wanted to believe. What happens after Severus is witness to the boy's home life? How does Draco react to meeting the-boy-who-lived? Why is the headmaster so upset about it?(Cross posted on Potions & Snitches as it's a challenge response fic)