#whether due to feeling antsy or personality clashes or conflicting traumas of what they've had to deal with and Missing Noct and

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ive been rereading your ffxv fic "im trying hard to take it back" for literally four years now. please end my suffering and tell me how gladio feels. please. PLEASE. (but only if u want ofc)

(fic) Short answer: Gladio feels insane guilt and spends a lot of his life trying to make this up to Prompto. In the process, they deepen their connection as friends and do begin a relationship probably around the one-year mark of endless darkness. <3

Longer answer: (implications of abuse/violence tw but no worse than in the fic itself; just what others assume to be true even if it's not in the context of this specific fic)

Gladio is a secret romantic at heart who has always envisioned meeting his soulmate, but he's also duty-bound and duty comes first. So even though he reads romance books (amongst other types of books too) and indulges in his head a bit as many people do, he's often put his duty to the crown first and foremost in his mind. He also didn't imagine his soulmate was anyone on this trip and thought perhaps the person he may have been fated to meet died in the assault of Insomnia. Even if they were a refugee, they can't be a priority to him at this moment. His priority has to be Noctis.

Prompto has obviously grown on him over the course of their road trip, but there are aspects of them that don't 100% mesh (as is true with every realistic relationship). That said, Gladio never in a hundred years would want this moment of (understandable but out of line) frustration and anger in the wake of Luna and Altissa to be a permanent mark on Prompto's face. He's genuinely horrified and disgusted with himself for a long time after this and spends most of his life trying to make it up. He feels like a dirtbag about it.

That said, Prompto runs away from him in this moment and they need time to calm down, just as the fic shows. Noctis goes after Prompto, just like in canon. Prompto falls off the train and has his Despair Arc just like in the DLC, now with the added despair of "well, in addition to being a clone, my soulmate hates me. And in addition to the mark of inhumanity on my wrist (barcode), I have a giant hand print of him literally Shoving Me Away on my face. Forever."

Aranea: Well, do you want to die about it. Or do you want to live.

Prompto, eventually like in canon: Live, I guess. But it will be excruciating.

Aranea: That's what living is. We do it anyway. Your friends love you. Get off the floor.

He fights his way through his issues and gets rescued like in canon. Gladio probably tries to talk to him when they all catch up again, trying to apologize, and Prompto tells him to hold off on that for later.

Then, of course, Noctis is eaten by the crystal and "later" becomes much, much later as they evacuate and try to survive in eternal darkness. (Though they also can't Not think about it because it's a giant hand print. On Prompto's face. And every person they meet has Something To Say about it, for better or worse, whether they knew Prompto before or not. Prompto cannot escape it, and when Gladio is not doing Crown Duties he feels he must do in Noct's absence, he's with Prompto, so he also Cannot Escape It either. Even when the person speaking is unaware that Gladio left that mark. It's almost worse when they don't know, but when they see it's Gladio, who is such a big guy who seemingly hit Prompto and left that permanent mark there, some of them get nasty to him and some back off out of fear. Both are horrible. The guilt is eating him alive.)

Eventually, enough time passes as the dust settles that they do Talk About It. Gladio apologizes sincerely, for the 500th time. Prompto's like, "Well. It's not like you could have known that this would be The One Time it happened." And then cracks a joke about their soulmate mark being a Prompto's hand print on Gladio's ass from a butt slap in another life, which does help the tension somewhat. (The more Gladio tries to apologize, the more Prompto grows sick of hearing it, so they just have to move on and keep going, as he's learned to do.)

They grow closer over time, especially because there's not a lot of people who have survived to this point and even less later on. They do get together romantically, both because they do like the idea of soulmates (for different reasons) and also because they're living out of each others pockets for years, so there's an affection and dependency that develops there. Also, teenage Prompto always thought Gladio was really handsome and teen Gladio thought Prompto was cute and sincere for a pipsqueak.

When they are out together on dates in normal settings surrounded by strangers after the light returns, Gladio will receive dirty looks for the rest of his life from strangers who see the hand print on Prompto's face and immediately (correctly) assumes it was out of anger rather than a funny accident or something. (Edit: Some people will assume there is a funny story attached. Gladio will not know what to say to this. Prompto will play along.) He will learn to live with this. Prompto is really grateful Gladio is with him despite everything.