You were Peters twin sister.You had found out about his powers about 5 months after he had got them

Now he was an Avenger which you thought was pretty cool

You had powers of your own.After a lab accident,you ended up with the power to move objects with your mind.Obviously you've never told anyone,neither had Peter.Well,that was a lie.He had told the Avenger about you but no one else

It's around mid day when you entered the tower looking for him.Aunt May was out and you were locked out so you needed his key.

You approached him and patted his shoulder,getting the attention of everyone there.