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Postnuptial Disagreements is a crossover Fan Fic for {{Sekirei}}, FateStayNight, and FateZero. It is written in first person from the perspective of Meriwether Archibald El-Melloi, the son of Kayneth and Sola-Ui from Fate/Zero, who survived an AU fourth Heaven's Feel. And he's pretty much [[ChasteHero exactly]] [[HopelessWithTech what]] [[SmugSnake you]] [[JerkAss would]] [[InsufferableGenius expect]].

On a trip to Japan to research his parents' role in the Fourth War, Meriwether finds himself stuck in the middle of the Sekirei Plan after Benitsubasa wings herself with him. Naturally, he leaps off the [[JumpingOffTheSlipperySlope slippery slope]] with the zeal of a true magus, making the Sekirei Plan a whole lot bloodier in the process.

Benitsubasa soon finds herself [[OnlySaneMan trying to deal with the insanity that her Ashikabi has unleashed]]. And get laid. Which isn't [[ObliviousToLove as easy as it sounds]].

Postnuptial Disagreements is also noteworthy for a surprising amount of [[CharacterDevelopment character development]] over the course of the 'fic.

It can be found [[http://www.fanfiction.net/s/8078340/1/Postnuptial_Disagreements here]] and [[http://forums.nrvnqsr.com/showthread.php/2269-Postnuptial-Disagreements-%28Sekirei-crossover%29 here]].

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!! This fic provides examples of:
* AntiHero: Meriwether. Though he might qualify as a VillainProtagonist, depending on your interpretation.
** Unsurprisingly, Meriwether thinks of Richard from Theatre/RichardIII as a hero, and not as a VillainProtagonist.
* AnyoneCanDie
* BigBad: [[spoiler:Karasuba]]
* BrainsAndBrawn: Meriwether thinks initially of him and Benitsubasa as this, but it turns out they are far more equal than he thought.
* CharacterDevelopment: Meriwether AND Benitsubasa, though your mileage may vary.
* CombatPragmatist: Meriwether learned from the mistakes of his father in the last Grail War.
* [[spoiler:EarnYourHappyEnding]]
* FirstPersonSmartass
* HopelessWithTech: Meriwether
* ImADoctorNotAPlaceholder: Kochou, Meriwether's [[spoiler:undead hacker.]]
-->''"I'm a computer expert, not an oracle."''
* InnerMonologue: Magus that he is, Meriwether compensates for his limited external monologues by providing a running commentary on everything from assassination techniques to [[ArsonMurderAndJaywalking home furnishing]].
** LeaningOnTheFourthWall: This is commented on by [[spoiler: Uzume]] when Merry uses a spell so that they share consciousness.
* TheJuggernaut: Miya
* MagicallyBindingContract: A favorite strategy of Meriwether is to manipulate or blackmail others into one with him. [[spoiler:Later, Higa and Miya use it successfully against him.]]
* MasterPoisoner: Meriwether
* MeddlingParents: Kayneth takes this [[UpToEleven up to eleven]].
* NobleBigot: Meriwether
* PairTheSmartOnes: One of the main reasons why the relationship between Benitsubasa and Meriwhether works is that they both are smart people who seek other smart people as partner.
* PapaWolf: Dozens of Sekirei and Ashikabis won't stop Kayneth from retrieving his son.
* SparedByTheAdaptation: Not only do Meriwether's parents survive the Fourth Grail War, but Kiritsugu and Ilya live much longer than in canon.
* TheyWouldCutYouUp: They really would, Benitsubasa.
* WhatMeasureIsANonHuman: Part of Meriwhether's CharacterDevelopment is to accept Benitsubasa as an equal and opposing the treatment she would receive at the hands of other magi.