So good. This fic is just right, certainly Sam didn't fight against Gene by only his superior future skill. It's his nature which might have came from the childhood memory of the father and a woman in red.
I think Sam is a fighter while Gene is a protector. That's why every girl needs them as a pair.
Without any sexual thing, you manage to hit my heart, quite a miracle. Please don't. I want to be wanton ever :D