After all, while an NPC might be nice, aside from a little unvoiced conversation most people take the official companions flirting (Cass, Veronica, hell you can recruit Arcade by flirting with him) to mean that these companions are romantically involved with you. If it's going to be done i'd prefer to see something proper like this. Then, after a certain point in the 'quest', you could get fade to black options to 'kiss' and such, and even asign were they 'live'. Hell, make the companions have special dates (like hunting Legionaries for Boone, for example) sinee they are 'special' npcs. Include some generic fluff (or as fluffy as the wasteland gets, because it has to be in character for people like Cass and even Boone) conversation. After this you would get a few 'quests' to take them to places like a bar and buy them a drink. how about a system similair to Goranga's Dating System for Oblivion? It would add a conversation option to any NPC you were interested in (within reason) and require a Speech/Charisma/LadyKiller/BlackWidow/LaFem/Bachalor check to gain their interest. But i'd raise you that while an NPC in a static location would be nice.
