From what I can remember Harry and Draco are married, but haven't had any children and Draco blames Harry for it. I know he beats Harry almost to death and goes missing. Severus has a little boy named David I think. Lucious and Narcissa end up adopting Harry, and the set of twins Harry showed Draco that set him off. In the end Severus and Harry end up together,
I also remember apparently Draco inherited the Black family madness. Someone attacked Harry in the backroom of a shop and Severus' son was with him. Help me please. I really need to bookmark this story.
If I am not mistaken it was Colin Creevy or Neville Longbottom looking like Draco. I wanna say it was Creevy.