Oh, I understand now. No, they won't have a romance plot since they're just supporting cast members. There will be ways to hook up with them, though. Right now I'm imagining them in group scenarios like a threesome, but maybe there will be one-on-one hookups, too. I haven't planned that out yet.
Outside of the game story, Parker also has his upcoming Grind'm scenario, and I'm pretty confident Blaze will win one of the votes, too, since he keeps ending up at the top of the polls.