>>2503178Not that anon, but I guess they're referring to the True/"Good" ending where [spoiler:lit]a nuclear attack happens in at least Hope County but most likely other parts of the country, leading to Joseph taking the Deputy down into a bunker and tying them (sitting on the floor next) to a bed.
Having killed Joseph's family, he tells you that you'll be his new family ("I should kill you for what you've done, but you're all I have left now. You're my family."), and it ends with the player realizing that everything they did for was for naught, as all their allies are dead and they're stuck with Joseph for potentially the rest of whatever life they have left.
There's a lot of potential for love, Stockholm Syndrome, rape, etc. (whatever people are into), as Joseph and the Deputy are all that each other has left (presumably).[/spoiler:lit]
I'm not sure if spoiler tags work on this board, so hopefully that doesn't look too bad.