Two Hearts Beating As One: Dark Fantasy

The sound of another heart beating against my chest made me freeze, my mind still tangled in the streams of dream and nightmare. It beat again. Not my heart; I knew the sound of my own heart as only I could. I knew the way that its sea-sounds throbbed in my ears. This was outside of me--and yet, not very far. It felt as if it were gently throbbing against my own heart, sitting directly on top of it. I let my hand ease across my chest, very, very slowly. It was not the feel of another's body pressing against mine and reverberating with the sound of their heartbeat. I knew that. This felt alone. It was a lonesome heart that beat against mine, as if it had been left out in the cold and forced to find a life where it could. And it had followed the sound of my heartbeat--

Inspiration: "What Sound" by Lamb
Story Potential: Medium-high to high.
Notes: Ya know those bleeding-heart tattooes people get? Yeah. Could be some form of fairytale retelling, could be fantasy, could be horror...would probably end up being dark modern fantasy.