ohh man. i think ive read a fic abt almost this exact thing somewhere, so i might be remembering parts from it when i talk abt this, but tbh id of said/thought the same things in that fic for these two. this got long too so another readmore aha
prompto would be the usual “noct you couldve died!” and upset and super worried and noctis would retaliate with “i couldve died? you couldve died!” and bicker about it before realizing they both care a lot for each other, and try to understand that more, same thing the other way around bUT this says a fatal blow so im gonna go sad now: theyre far from the battle that caused this, being able to escape and lay against a tree with prompto holding noctis in his arms saying its gonna be okay over and over, cursing him bc he couldve dodged it just fine and that noct wouldve been okay, wouldnt be dying in his arms, holding his face so close to his own, crying on his cheeks. noctis is trying to speak, trying to tell him its okay, his hand holding promptos face, rubbing his thumb against his cheek. prompto is a complete wreck, his best friend, the person who he loves so much cant be dying, he cant be, it has to be a nightmare. he cant even form words anymore, just broken whimpers and sobs. hes holding noctis’ other hand, grasping it tightly, that maybe if he held it tight enough, he wouldnt die. noctis’ breathing is getting slower, his lips forming the words “i love you, youre going to be okay, prompto.” prompto cant feel noctis’ breath against his face anymore, his hand went limp, promptos hand is desperately squeezing it to feel any sort of reaction. hes screaming his name, hes never screamed so hard in his life, his thoughts are a disaster, filled with “nonononono he cant be dead he cant fucking be dead; please say something noct please fucking say something; i never told him i loved him back i never even confessed; oh my god oh my fucking god.” his chest is exploding and his throat feels like its being ripped out, hes in so much pain, hes not even forming coherent sentences or words anymore. soon his screams dwindle into broken silence. he couldnt save the person he loved most, never even told him how much he loved him. he stays with him the whole night, barely moving. the others come to get him the next morning, saying they need to bury him, but prompto isnt listening; the only thing he hears is the last thing noctis tried telling him. theyre pulling him away and he isnt fighting back. he knows there isnt anything he can do, fighting to stay next to him wont do anything. he wasnt able to save him. his mind races through thoughts of what kind of friend was he if he couldnt save him, how would he cope, how would he tell others that he was essentially the one who killed him, unable to stop him from pushing him out of the way, unable to keep him alive. ignis and gladio know its not a good idea to leave the kid to his own thoughts, staying close by him each day from that point, making sure nothing he does is ever dangerous, making sure he gets better. after all, noctis isnt there anymore to keep him safe.