The Familiar of Zero: Mage of the Ether

So we all know how the story goes.
A failure of a mage wanted to summer a powerful creature as her familiar, but all she got was a normal perverted Japanese high-school kid that became Gandálfr.
Let's change things up a bit.
What if Saito was the successor of a mage family?
What if he had a tragic past, promising himself that he would never use magecraft again?
What will happen when Louise summons this incarnation of the ether?
Will Saito finally get over his trauma?
Only time will tell.

Fate x Familiar of Zero crossover.