Chocobros’ s/o manipulating them into betraying Noctis/Lucis and serving Niflheim? How does it happen and how quickly they realize they’re being manipulated (if ever)?

Prompto:

His S/O would call him everyday. Whisper sweet nothings. Keep him wrapped around their little finger and ask questions that normally, he wouldn’t answer due to safety concerns. But he loved them. And they loved him, so he was sure he could trust them. He’d let slip plans and time frames of where the group is going, what they’ll be doing, and where they were heading after that. Just stuff you’d tell a lover honestly. From this, over time, the S/O would be able to chart preferred routes and coordinate where drops ships can ambush them. 

That’s all that was asked of Prompto’s lover. They don’t tell Prompto, and he doesn’t ever realize it. No, instead with their job done, they break up with him, citing that long distance really wasn’t their thing. (But even they think it would be cruel to tell him that he had helped the enemy. They’d broken his heart enough.)

Gladiolus: 

They’d be right beside him the whole time. They’d encourage his irritability and whisper doubts about Noctis’ abilities, picking up on the shield’s own doubt about his king. But they ‘knew’ that Gladio could handle what Noctis didn’t right? He could protect them all if it came to it, right? With their manipulation, would become overbearing. Out of sync with the rest of the group. Worried about his own worth as the prince’s shield and the protector of his friends. Reckless on the battle field. It’d be all to easy to get the drop on them now.

The final nail would be their own injury. They’d let themself get back into a corner by an MT, damaged beyond returning to the field with them. Ever. It would hurt Gladio that he failed to protect one of the people he cared about in the world. And in this way they would crack the shield. He, likewise, doesn’t realize he was manipulated. (But there would be this feeling on the back of his neck, like he missed something, or that something with these past few months was wrong. Something didn’t quite…fit.) This was only to buy time, because they knew the group would eventually work it out. But the time they won from them would help the empire plan and move against them. And it’d be enough for their duty to be done. 

Ignis:

He’d be the one to realize it right away. And the S/O would know he knows. And it’s be this weird dance around each other, neither one letting the other get the upper hand. Because they actually like each other. And Ignis would be sure he can keep this under control. And he does. He wants their attention on him and him alone. And in the S/Os mind, they’d have to get past Ignis before anything else could be done with the boys.

Nothing comes of their work. Because they’d failed the moment Ignis noticed, and if they were being honest with themselves, they’d be killed for their failure. So just a little longer, and just a little more with Ignis. Because they were happy in their own way. Knowing they’d failed there was nothing to lose. So they’d enjoy his attention for a little longer.

But then the dance ended, and so they went to their fate.