Henry David Thoreau

 It was his fingers that Blue felt on her face. He touched her cheek with the backs of his fingers. Tears coursed down the other Blue's face. Though some strange magic, Blue could feel them on her face as well. She could feel, too, sick, rising misery she'd felt in the churchyard, the grief that felt bigger than her. The other Blue's tears seemed endless. One drop slid after another, each following an identical path down her cheeks.
Impossibly, Blue realized that this other Blue was crying because she loved him. And that the reason he touched her like that, his fingers so careful with her, was because he knew that her kiss could kill him. She could feel how badly the other Blue wanted to kiss him, even as she dreaded it. Though she couldn't understand why, her real, present day memories in the tree cavity were clouded with other false memories of their lips nearly touching, a life this other Blue had already lived.
Okay, I'm ready- his voice caught, just a little. Blue, kiss me.