Fate as a Servant

Is it not enough being reborn in the Nasuverse? Is it not enough being a servant? I can deal with all this, but why do I have to be Aqua?! She shouldn't even be from this verse so why?!?! Mc won't be as stupid as Aqua just in case. There is smut. I know what you are thinking, not useless Aqua + smut? Absolute perfection. Well... you are absolutely right. Slightly AU, changes will be explained. Neither the images nor the fate verse belong to me. Each belong to their respective authors.