Dark Wizard Harry

[My observation continues! This time with Drarry sprinkled in for flavor.] Au: Harry is in his third year, Sirius Black is on the loose, Ron and Hermione are always fighting about Crookshanks and Scabbers, yada yada yada, but also Harry and Draco are dating. Story: Draco, Ron and Hermione were having their usual day, when they suddenly heard Harry calling for help. Draco wasn't about to ignore his boyfriend calling for help while Ron and Hermione weren't going to ignore their best friend's cry for help. They saw a cloaked fight dragging Harry through a portal and they follow them... However, they definitely didn't expect to end up in an alternate universe or that the kidnapper is actually that world's version of Harry who went down a dark path. (Dark Wizard Harry is 18, for reference. Although his usually green eyes have red irises, black sclera and there are black cracks on his face due to dark magic, you can change the appearance, but age stays the same.)