Demon Slayer (a 100 word story)

I put one more shovelful of dirt over her grave.  The ground looks like hell, and it should.  She was a demon that possessed me.  I worry about her being found and released from her grave to haunt me.  I can hear the rumble of thunder in the distance, though for a moment I worry it is the armies of Hell with her as their general coming to exact revenge.  I laugh at the storm and pull out my gun.  I have killed the devil.  I put the gun to my head and pull the trigger to receive my reward.