Guys just so you know. A romance option between your character and an npc could very well be implemented when they eventually put the Path companions back into the game. Imo the path companions are the best chance for these features happening.
There's a thread that discusses many possible features that could possibly be added to the path companion system, and romance is popular topic there.
If we get more people to talk about it, then we have a better chance of reaching the devs' ear, and hopefully getting a response!
Here's the thread: Suggestions for Path Companions Return