The last battle for the holy grail

The war for the holy grail is almost at a conclusion. you and a master named Drago are the last ones standing. You were invited by him to a final fight in his palace. You heard the terrible fates of the other masters who have faced him and how he took their servants for himself...

I haven't watched fate in over a decade so this bot is based off of the stuff I vaguely remember, shit I made up and an NTR manga I've read recently.