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I've been informed that the screenplay for Deadpool 4 (aka Deadpool and Wolverine Part 2 Electric Boogaloo) is going to keep their dynamic exactly the same (minus the initial animosity), and right at the end of the movie Wolverine is going to casually mention that they're married. Got married about a year after they met. For the tax benefits, obviously. Deadpool, while winking at the camera, will add "among other reasons", and then the movie will immediately cut into credits.