AU Luke's still on the farm. All throughout his life, rumours of his father have both comforted and haunted him. Maybe Owen or even some of the locals spin this story about some hyper-masculine, tall, strong figure of a man, and use it to put Luke down for being so "weak" ('Wormie', anyone?) and smaller, and dorky or whatever.
Although Luke longed for his parents, he's always had a slight fear of his mother and/or father miraculously turning up and finding him wanting. He's not smart enough. Strong enough. Big enough. Charismatic enough.
When Darth Vader himself comes knocking, it's terrifying for more than one reason. But Vader, although absolutely intending to make Luke his heir, surprises the boy by not even questioning that he's strong enough to train.
Gen, Luke intimidated by his father's reputation
Although Luke longed for his parents, he's always had a slight fear of his mother and/or father miraculously turning up and finding him wanting. He's not smart enough. Strong enough. Big enough. Charismatic enough.
When Darth Vader himself comes knocking, it's terrifying for more than one reason. But Vader, although absolutely intending to make Luke his heir, surprises the boy by not even questioning that he's strong enough to train.
Can be serious, fluffy or cracky, don't mind!