[Fate/Zero] The Devout Disciple (Kirei and Kiritsugu)

After watching Fate/Zero, I inevitably became a Kotomine/Kiritsugu shipper. Father Kirei and Papa Kiritsugu are just too adorable together! My brain is overflowing with all the love I have for this pairing! (●′ε`●) That's right! This time it's an alternate universe: Assassin (former priest) Kirei x current priest (former Assassin) Kiritsugu. Imagine a world with the Fate/Zero setting, but no Holy Grail War: 1. Irisviel and Maiya are dead (there's a conspiracy behind it). 2. Heroic Spirits are no longer Heroic Spirits, but living people. Saber and Archer are Illya and Shirou's respective guardians, and their Master is Papa Kiritsugu. 3. Father Kirei still has an adoptive father, Risei, a teacher, Tokiomi, and a delighted love counselor, Gilgamesh. 4. This story is sweet in the beginning and a little angsty later. 5. Everyone's goal is a happy ending! *☞(●′∪`●) The main pairing is Kirei/Kiritsugu, with a little Archer/Shirou. I'll do my best to avoid OOC and capture the feel of the original Fate/Zero. This is my first attempt, so please bear with me.