I think having more relationship-related dialogue options open up between you and your companions as you progress would be good. That way some flirting can happen between PC and party members before they want to jump in your bedroll with you. Maybe something similar to Fallout 4? Although I dislike the way flirt options are basically just a CHA check in FO4.
I rather advise to use areal RPG and good one as example like Fallout New Vegas. Thats how you write characters and romances.
