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The Emperor's throne room, the 2nd Death Star
The dark side engulfed him as he kept striking Vader. Vader his father, not the father he had always dreamed of, but still his father.
Just as these thoughts comprehended he did it he killed Vader, Anakin, The hero with no fare, his father, his sister, good twin sister's father died.
He hardly herd the Emperor's laugh as he approached him saying,"Good boy, good."
And like that Luke had an idea, the most risky idea he'd ever thought of. He could do it but could he then so anything again.
One lol at the emperor was all it took, the evil twisted face.
Then he did what none had ever done before Jedi, Sith never had it been done before but he was doing it, anchoring his father's life force, force signature, all to him connecting there very future.
And then it happened what had never happened before, the two most powerful force users in history, father and son became one.