So.. this is actually literally called Mr & Mrs X
it's a mini-series by Kelly Thompson and Oscar Bazaldua, and it's supposedly a sequel to Rogue & Gambit.

Why the fuck was this classified?

oh, and the sauce
https://www.bleedingcool.com/2018/06/14/whos-writing-and-drawing-x-classified-i-mean-mr-mrs-x/