Finally I got it! I have re-read this story few weeks ago: Compromises and Reunions by Lillonely

Here's another story I love:

Quote
But it was too late. She saw Clyde reach for his gun, and a million things ran through her mind in mere milliseconds. He was going to kill Clark.

There was no way she could let that happen. Not having any time available to think, even breathe, she threw herself in front of Clark, just as a single gunshot rang out.

An acute pain instantly ran through her, but she knew Clark was okay.
Simona smile