If Peter-2 and Peter-3 knew how Peter-1 was blackmailed by Tony, they'd intervene to save their fellow Spider-Man
Apparently this scenario had the other two Peters becoming aware there was time-travel tech. The idea is that Peter-2 and Peter-3 would go back in time to make sure Peter-1 had a better fate by telling him their own experiences with unstable scientists (and rich men) with God complexes.
Note: Set in an AU where the other two Peters had access to dimension hopping.
***
Peter knew what he had to do. He had to go with Mr. Stark to Germany or risk Mr. Stark telling Aunt May about Spider-Man. Right now Mr. Stark was telling May about some fake internship weekend visit to Stark Industries or something. It wasn't going to take long.
Suddenly a light flashed and there were two guys standing in his bedroom. The first one looked like an older version of him with really straight hair in a side part, while the other one was a bit taller and leaner.
Peter asked, "Who are you?"
They said together, "Peter Parker."
Peter said, "No way."
Older Peter lifted an eyebrow and shot a web with his BARE HAND.
Peter said, "That's so cool."
Taller Peter said, "Yeah."
Peter asked, "Where did you come from and why are you here?"
Older Peter took Peter by the shoulders and said, "We're here to save you from a MAJOR screw-up."
Peter looked at the two men and sat down. He said, "I don't understand."
Taller Peter sat next to him and said, "Listen, you are at a major crossroads right here, right now. And we're here to tell you--DON'T do it."
Peter said, "Don't do what?"
Older Peter said, "Don't trust Tony Stark."
Taller Peter nodded and said, "That is serious bad news, kid. We've seen the timeline, and let me tell you there are COSMIC consequences and a world of hurt coming your way if you go with him to Germany."
Peter bit his lip and said, "Mr. Stark promised me a new suit. He said I needed an upgrade."
Older Peter said, "Is that what you really need, or what he said you need so you'll go along with what he wants?"
He leaned against the desk and continued, "It seems like Stark wants to use you, not help you."
Taller Peter nudged Peter and said, "Think about it. Should a middle-aged dude be messing with somebody who isn't even old enough to drive? It's creepy."
Peter said, "But he'll tell Aunt May if I don't go with him."
The two Peters looked at one another. Older Peter said, "So? You know how much May cares about you. You really think being able to stick to walls or lift a car is going to change that?"
Taller Peter said, "Listen, we can't change our pasts. Everything we've lost, none of it's coming back. But YOU can make different choices."
He stood up and said, "I hope you think about it, because there are a LOT of lives in your hands."
The two Peters stood close to each other and Older Peter pushed a button on a device on his wrist. He said, "Good luck, whatever you decide."
Peter thought about everything they'd said. Then he nodded to himself. He walked to the door, ready to tell May about Spider-Man and tell Stark to get the hell out of his home--and never come back.