I am all in when it comes to the idea of a "village bicycle" branch to the NTR ending for all four girls and would absolutely love to see that option... But if that doesn't pan out for specific story reasons in this case (i.e., just not making sense for certain characters like the Duke or Ulrod), I just hope that we might see something like that in a smaller form for a little more variety — whether it's just pushing one of the sidequest girls like Haylen down that path, where it would still be optional content for anyone who is seriously bothered by it... or just keeping it in mind for Chapter 4 down the road.
I share your enthusiasm on the matter, but unfortunately it is unlikely that we're gonna get anything like that in a smaller form if this second NTR ending ends up not happening for whatever reason. The only thing we can do is hope that Chaper 4 will introduce the village slut route/ending.
As for HC3, based on the previous games, some sharing WILL happen, and even if that's the best we're gonna get...it is what it is, i'm more than fine with it.
¯\_(ツ)_/¯
I don't know about Rose&Cyanna but i'm almost a 100% sure about Haylen and Lily, i believe that N_Taii even said something regarding Lily that Tavros might take part in her corruption. There's also that wealthy douchebag that spanked Lily in her 2nd scene, he could easily make a comeback in a future scene.
As for Haylen, i don't remember exacly what the quest was about, but in one of Halyen's quests, there was this scene where Haylen was walking home with Jazon at night and they ran into Jazon's...i wanna say Uncle but i might be wrong about that, doesn't matter, it was a relative of Jazon that's all i know, if there's gonna be another person besides Jazon who's gonna have sex with Haylen, i'm betting everything on that guy.