Boxers and Balloons

I felt my heart beat against my ribs
as if it was a boxer in a match.
It hit harder and harder
with each breath I took.

The air in my lungs left
as if it was squeezed out of a balloon.
The lungs deflated quickly
and left them empty.

My eyes fluttered like butterfly wings
as they eventually closed.
One last breath escaped
as the rope tightened.
♠ ♠ ♠
Simile / Metaphor #1 for my poetry final in Creative Writing