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so basically peter has ptsd from the snap and maybe homecoming but he and Tony’s relationship has progressed to the point where he called Tony “Tony” and Tony looks out for peter and makes a million protocols for Karen for literally every situation that could happen on patrol or whilst dealing with ptsd.
one such protocol helps with peters flashbacks. it is activated when peter refers to Tony as Mr. Stark because it is the simplest way to differentiate a panic attack and a flashback (which present similarly in peter)
so far the protocol has been successful in identifying flashbacks because peter has said ‘Mr Stark’ within the first few minutes of every flashback that has happened while under Karen’s watch, so tony feels no need to change the protocols trigger until…
…
cut field trip, flash says something like “oh penis parker is your best friend tony stark going to come greet us? is he gonna give us the tour cause he knows you so well??” peter replies tiredly like he has been for the last few days and entire bus ride here “Mr. Stark is a busy man. he has work to do and he doesn’t bother himself with tours”
…
lil Karen pov peek her being sups confused. maybe she goes as far as to ask Friday for advice and the consensus is call Tony
…
in tony pov an audio link connects tonys ear piece to the elevator speaker
tony scrambling to get to peter while also speaking in a worried-urgent-soft dad voice asking peter if hes okay, and saying hes on his way.
peter super frazzled trying to salvage the situation in his mind in order to not reveal his identity or his intimate relationship with tony but just stammering “I— um… Mr Stark, what—im not—sir—“ out loud
tony: just talk to me peter its okay. im on my way peter, im almost there.
…
recap a bit with petes pov explaining the stammering and what was going on in his head, then move forward to tony basically giving peter a panic attack, mj cutting both the idiots off and having to explain that pete was fine until you called tony “so should I not come?” “no dumbass he needs you now”
yay happy ending with enough irondad fluff to forget about the angst of ptsd peter