Blessings From An Ancestor

Harry gets sorted into Slytherin and is assigned to share a room with Draco Malfoy, who, as it turns out, isn't as terrible as he seems when you get to know him. He's arrogant, yes, but he's also smart, funny, and generous under the guise of pity.

He's also shameless.

He undresses right in the middle of their room, not concerned that Harry might see. Or maybe that's what he wants, is what occurs to Harry, as he watches an absolute behemoth of a penis flop out of Draco's pants.