He touches her face and she makes a small sound. She leans into the kiss a little more, for a moment, then allows their lips to part, keeping her forehead against his.

"You need to understand," she whispers. "I don't want to lose you. I can't lose you. I can't live with your ghost, either. If I went away, and something happened to you..."

She shakes her head slightly, again smoothing her thumb over his cheek.

"You think you're the disposable part of this picture. You're not. I...I'm better with you, Sherlock."