If I may make a suggestion... If you believe that smut doesn't work in the context of this story, then much as I love it, it would probably be a very bad idea to force it into the story. I love cheesecake, but putting cheesecake in a stew would be a very bad idea, it just doesn't belong there ;) But. Have you considered world-building? You have already written a long fic that introduced your world rules (how Respawn works, how the RED and BLU Companies work with multiple teams and missions all over the world, etc etc), your characters (both OCs, like Canadian BLU Spy, and personal interpretations of official characters), and their relationships with each other. And now you have another on-going fic that is further expanding and developing them. So why don't you just continue and finish Our Lost Kingdoms smut-free, if you feel that that would be the best for this particular story, and then use the established universe as your playground to write all kinds of further stories? Not just epilogues or asides, but actual expansions and branching out, of whatever genre and rating and with whatever protagonists you feel like writing about at the time. You could play around with them however you want: some fics could be long and dramatic, others could be short and fluffy, others yet could be kinky PWP. You already write your stories in different first-person POVs, and your two fics are of completely different genres. Add in the fact that your fics are so good, I have no doubt that you could pull it off.