The initial warning was that this shouldn't be too sad but I lied. I lied so hard by the time I finished this- trigger warnings for eating disorder, general angst, and mention of death.
In this reality, someone else died instead of Tony

Ironstrange dads, Peter son

Peter has an ED

~~~

It's not that Peter didn't like to eat, or felt that he had to lose weight- no, he had just gotten used to either not having food to eat, or not having the time.
Because of this, he could go to bed, and no matter how hungry or not he may have been, he would wake up not feeling hungry.

Now, usually, Tony and Stephen are good at keeping his eating schedule steady, however, Tony noticed the many times where Peter would say he wasn't hungry at breakfast, and sometimes even lunch.

Right now, he was training with Tony and Stephen in a room Tony had built specifically for that purpose.

Stephen noticed Peter's hands shaking slightly whenever he would throw a web, and eventually decided to say something.
"Hey, kid." he says, Tony and Peter both stopping. Peter looks at him. "Yeah? Was I- did I do something wrong?" he asks. "Well, TBD. Your hands are shaking, kid. Are you alright?"

".. Your hands shake-" Peter said, avoiding the question. Stephen crossed his arms, Tony joining in the conversation and standing next to Stephen. "Stephen has nerve damage in his hands, that's why they shake- last time I checked, you don't." he says.
"Peter, I'll ask again. Why are your hands shaking? Are you afraid? Tired?" Stephen asks. Peter shook his head. "No, neither of those- look they're always shaky, I'm used to it-"

Stephen thought for a moment, then gave him a curious look. "How much have you eaten today?" he asks. Peter's face flushed, realizing he didn't eat all day; he hasn't eaten since 9pm yesterday.
"U-um... Right, yeah, uh- I've.. Definitely done that.. Today.. Yeah.. Food's important, that- that's a... A thing-" Peter stammers, scratching his neck awkwardly.

‘Dads are gonna be so pissed-’ he thought.

"Hey Friday, what time is it?" Tony asks, looking at the ceiling. "Currently 4:02pm, sir." Friday responds. Tony then looks at Peter. "When did you last eat?" he asks. "... Dinner.." Peter mumbled in response. Tony's eyes widened slightly, furrowing his eyebrows.
Stephen sighs. "So, low blood sugar.. Kid, you gotta at least try to eat something." he says. "A-and I will, honest! I like food, food is good- I just.. I um... Forget to eat?" Peter says.

Tony sighs, taking Peter by the hand and walking out of the room. Stephen followed behind, telling Friday to shut lights off in the training room.

~~~

After eating, Peter was sitting at the table, looking at his dads. "... Look I know you're mad-"
"Not mad, worried. Not eating isn't healthy, Peter, especially for someone who's still maturing." Stephen says. Peter sighs, running a hand through his hair. "I know, I- I know, it's just- I'm so used to not eating a lot, I genuinely sometimes forget- I could go to bed hungry and wake up not feeling like it, it's not like I mean to.."

"... Tell you what, kid, if you had a way to be reminded to eat, would you?" Tony asks. "Pr-probably.. Why?" Peter responds. "Alright."

~~~

A few days later, Tony asked Peter to come down to his lab. Peter obeyed, going down to his lab and looking around in awe, even though he's seen it a thousand times.
"Kid, hey. Try these out." Tony says, handing him a pair of glasses. Peter took them with a confused expression. "Um, okay?" he says, putting them on.

"They're like the ones I have, but I modified it specifically for your needs as well as what she can already do. For example, she'll tell you when you should try to eat, she'll help you calm down if you start having a sensory overload, she'll let you communicate with me, etcetera. I also programmed it into your suit, and connected your phone to it." Tony says.

"So Friday is programmed to this?" Peter asks. "Yep, try it out, ask her to do something." Tony says. "Uh.. Okay? Um.. Friday?" Peter says. "Yes, Peter?" Friday responds. "Uh.. I-i dunno what to ask her, Mr. Stark-"
Tony rolls his eyes. "Anything, kid, literally anything." Peter thought for a moment. "... Friday, pull up contacts." Peter says. "Here's a list of your contacts, Peter."

"Yeah, good, great- um, can you change a contact name?" Peter asks, pacing a little. Tony tilts his head slightly, watching the kid. "Certainly. Which contact would you like to change?" Friday asks.
"Change.. Change ‘Mr. Stark’ to.. To ‘Dad’." Peter says. Tony looks at him, not knowing fully if he felt honored, embarrassed, or happy at that. Maybe all.

"Contact name changed. Is there anything else you need, Peter?" Friday asks. "No, um.. Well, actually, what time is it?" Peter asks.
"9:06 am. You should try to eat, Peter." Friday responds. "Yeah, right- yeah.. Thank you, Mr. Star-.. Dad. Thank you dad." Peter says, giving Tony a small smile before heading to the kitchen.

"So you're dad now? What's that make me?" Stephen asks, leaning against a wall behind Tony. Tony turned around, letting out a confused chuckle. "I- uh, heh-"
"The kid sees you as a caregiver, Tony." Stephen says, smiling a little. "Yeah, that much was obvious when he.. Uh, blipped?.. He hugged me, he was so scared.. I-i thought I lost him.. Truth be told, I see him like a son.."

Stephen frowns, walking up to Tony and putting a hand on his shoulder. "I know how.. Awful the fight with Thanos was, and I know.. I know it ended in a devastating way but.. At least you've got the kid, and he's got you. That's what he needs right now, Ton."
Tony sighs. "But why did it have to be-" Stephen cut him off, gently connecting their lips. "Try not to focus on it too much, okay hon?... There's nothing we can do now.. And I know that hurts, but we have to try to move on, okay?.. I love you.."

"... I love you too, Stephe.."