He sensed that he had her full attention now. Not that he hadn't before, but now she wasn't waiting for a break in topic to ask questions. She was stunned, and waiting for his explanations. Very well.
"I began to have these... dreams. Visions, through the Force. They showed me Padmé, in pain, dying during childbirth. She was already pregnant with our child. I'd had dreams similar some years before, of my mother. In pain. When I returned to Tatooine to see her, I learned that she had been... taken by Tusken raiders. But I was too late. She died in my arms." His voice faltered for a moment. Even after decades of time, the memories still hurt. Seeing her, the way ber body had been broken and battered, patting his cheek with broken fingers to tell him how handsome he looked before letting go of the last of her strength. Still painful, his memories of the slaughter that had taken place right after, killing every Tusken, down to the last child.
"I couldn't let that happen again," he said, voice no more than a whisper against the emotion the retelling had brought. "Not to Padmé. And Master Yoda's advice was... less than helpful. The only one who had an answer was Chancellor Palpatine. He told me of a Sith legend, the Tragedy of Darth Plagueis the Wise. Darth Plagueis had such control over the Force that he could even prevent the death of those he loved." Anakin let out a breath, slowly. "I believed him. And I wanted that power, so I could save Padmé. And when I told Master Windu that I suspected the Chancellor was a Sith Lord, Master Windu tried to kill him. The answer to save Padmé would have died with him." His eyes squeezed shut. "So I... we..."
The words didn't want to come. Anakin controlled his breathing, fighting back the horror of the truth so he could speak it. "We killed Master Windu. And then I pledged myself to him, to his teachings. And he gave me the name Darth Vader."