Wow! This is, holy hell this is great! The grammar in some places makes it a bit difficult to understand and it seems a few words are omitted, but from what I've read I must say I'm in love! Sakura deserves happiness. It's a pity shirou hasn't been born yet (he was born from the fire, as of now it's a completely different boy), i would have loved a kid shirou befriending this sakura.
Tokiomi in his mind did the right thing, but to the rest of us he was being stupid. Personally I like seeing him try to justify his actions only to see the consequences of them.

...who is this Caster? is it medea?