I'd like to lean on other GM's more extensive experience on whether or not to set up an opportunity for inter-party betrayal.
If this were a case of simply the Big Villain trying to persuade the whole group of incorruptible NPCs to "turn to the dark side" I wouldn't think twice about it as I can almost guarantee the "hero PCs" would reject the offer out of hand. But this is instead about trying to tempt one PC to turn on the other PCs.
Details/backstory:
In the second session of this game Our PC Gand BH found a stash of credits, and then choose not to share with the group. As a player they apologized and indicated that is was their character would do. The other Players seemed a little bummed they missed the credits, but didn't see it as a serious problem. No other selfish acts have yet to occur from that PC (however no real opportunities have come up either). Now the PCs have just met a NPC Gand Bounty hunter and the PC Gand BH is enamored (their words) with the NPC BH, like role model status . Next session the NPC is about to is about to find about the bounty on the PCs and try to turn them in. So here's the offer: The NPC BH could try to persuade the PC Gand BH to turn on the other PCs and try to collect the bounty. Obviously the NPC BH would then almost immediately turn on them in-kind and then all the PCs would have to reconcile and escape together. *side note: The players and I are all IRL best friends and have gamed together for probably about 10 years, so I am not too concerned about lasting animosity, but one can never be sure.
I think there is a 50/50 chance the Player would take this deal, as they are pretty decent about role playing their character's motivations (though truthfully I can't say for certain what those motivations are).
But ultimately I have to ask myself what would be the benefit of the potential outcomes. From a narrative point of view this could create an amazing narrative, either the Character realization that they care for their allies and would not turn on them, or about betrayal and redemption...But I am fully aware that this isn't a novel with characters i control. I have to consider that its first and foremost about the Player's characters, and I am not looking to intentionally create animosity or hurt feelings for the sake of story.
Honestly as I type this all out I'm realizing this is sounding more and more like a terrible idea; there's just too much that could go wrong. PCs fight each other and someone dies, Players feelings hurt etc. Not to mention i'm actually feeding in to driving a divide between the players....Yeah this is a terrible idea. I think if I really wanted betrayal I will stick with having a trusted NPC betray the PCs.
Now that I have thought this over I feel like the only way it could possibly work is if I talk to the PC ahead of time and "script it out", so that they are "in on it" in order to avoid disaster.
Whelp, thanks for coming along with me on that journey of failed thought. I guess let me know if you have successfully/unsuccessfully done this or have insights.