Your drabble is a bit of Spuffy dreaming of previous lives.
She dreamed that she was a princess, and he was a knight. A once upon a time romance, complete with him kneeling before her and kissing her hand as if she were the most treasured thing in the world.
That hadn't really changed.
She dreamed that she was a colonial, and he was a redcoat. Despite the war that divided them and an ocean that separated their countries, they fell in love. When he fell and the rest of the world cheered, she wept.
She dreamed that was a pioneer, lost on the Oregon Trail with him by her side. There was pain and fever that clouded her vision, but the one thing that stayed true was him by her side, her hand in his, his voice promising her things that he couldn't give her, but he wanted to. A home in the mountains. A fortune of gold. A life beyond just a few minutes. Love, eternally.
She was fairly certain she had that.
When she woke, he was right next to her, smiling. “You're beautiful when you sleep, you know that?” he whispered, and Buffy smiled.
“I love you,” she whispered back, and the way his face lit up, even after all these years, amazed her.
His love, eternally. She was more than fairly certain that it was hers.
~Nebula