I'm sure I'm missing something here but how do you get Everett to like you ? I can only met him at the outpost for now and can't speak with him unless it's about the war
You can catch him having sex at the market at night if you promise to keep his secret when you confront him about that you get likes with him, you also get likes from giving gifts and if you seen the scene of him at the market at night before he meets Feliar and Korg you can encourage him to spend more time with Feliar and see and participe on some of his visits to Feliar's house during the visit you can participate you can choose to do something lewd or not if you don't do anything lewd you can increase Everett's likes
I didn't notice any behavioral change but I also rarely interact with him unless there's a new interaction on the update note... so I wouldn't know for sure and I have my Everett at 25 I know his max likes because someone else told me, that's also how I learned that you can raise his likes on a weekly basis lol