An Alternate Star Wars. Completely AU. What if Darth Vader wasn't actually Luke's father….
Disclaimer- I do not own Star Wars.
"You killed my Father!" Luke shrieked, one shaking hand gripping the rail that was his only lifeline from the enormous fall that lay below. The other hand was gone, his arm amputated at his wrist. The wound was, fortunately, bloodless, cauterized by the red, lethal blade of Vader's. Vader himself stood above Luke, and the dark, cloaked and masked figure was as unreadable as ever. His breath rasped out, but apart from that, he was silent.
He straightened, and Luke somehow sensed he had come to a decision. "No Luke," he started, "Obi-Wan killed your Father."
Luke's grip on the rail weakened, and his mouth fell open in a comical display of shock. "No…," he murmured, then his eyes bulged, and he screamed, "That's impossible!"
A noise akin to a laugh came from Vader, and he shook his helmeted head. "Search your feelings, Luke," Vader urged.
"Liar!"
"Obi-Wan is the liar!" Vader bellowed, "He has done nothing but deceive you! Out of guilt he had trained you, nothing more. He has led you to your doom." Vader paused, and when he spoke again, his voice was lower, calmer, "But," he began, almost slyly, "I grow weary of the Emperor's rule. If you are of Skywalker's line, you are worthy of much greater things then serving a long gone order. Join me, and we shall rule the galaxy!"
Luke's skin was pale and sickly, his breath short. But he still managed to cry, "I'll never join you," before releasing his grip on the rail, and falling into the darkness below.
Up on the deck, Vader watched as Luke fell. His mask was impassive, but below, his mind was in turmoil. Skywalker cannot die! he wanted to scream. He clenched his fists, and searched the Force for Luke. With relief, he found the boy to still be alive, for now. Vader gave the equivalent of a chuckle, "That old fool thought by training you he could make up for his past sins, did he?" Vader murmured, "We'll prove him wrong… my apprentice."