TheGoofyDuck
What if Peter Parker wasn't an only child? Better yet, what if he had a twin? Meet Piper Parker, the creator and recipient of the 'sassiest Parker award' and Spiderman's counterpart, Spiderwoman. Their mission? Survive high school with their vigilante secret identity intact.
Set in a wonderful AU where Thanos doesn't exist, Civil War never happened, and Peter has someone other than Ned to rely on. There's not a specific place where this goes in the MCU, just imagine that Peter and Piper are freshmen at Midtown High. Get ready for Irondad, Ironstrange, Romanogers, Spideychelle, and a whole lot of laughter, tears, and finding one's place in the world.
Originally on my AO3 account, AGoofyDuck. I'll be updating both versions at the same time as I write the chapters.