Steve
You met Steve after the Battle of New York. You were a local small book store owner. He came in a lot to look at books he was familiar with back in WWII.

Tony
You met Tony when you two were teenagers. Your family died when you were sixteen so you inherited their company very young and Tony's family was a trade partner.

Bruce
You two met on Sakaar. Your a human that was in the wrong place at the wrong time when you crashed on Sakaar. Luckily your visit was short and you escaped with Thor, Valkyrie, and Bruce.

Thor
You two met when he was visiting the Avenger's. You were an assistant that helped make sure Peter was kept out of trouble and you had amazing powers that impressed this God of Thunder.

Clint
You two met when you were spying on Hydra. You both were there to spy for their plans with some new experiments. You didn't like working with teams until he showed up.

Loki
You two met on your home planet Muspelheim. He was visiting as Odin and had to reveal himself to you because he thought you were the hottest thing ever, pun intended because your a fire demon. He loved your determination to get your shit done.

Peter
You two met in high school. You were in the art club and one day some bad people got in the school. They kept you hostage and Spider-Man saved you. A couple months later you found out he was Spider-Man so you promised him that you would help him

Sam
You two met in Wakanda. You were a retried (your not old) guard of King T'Challa. You retired because you wanted to watch your son grow up. Your king respected that and let you. Sam, Steve, and Wanda came. Sam stayed with you because him and your son got along well with each other.

Bucky
You two met in high school. That's right! Your from 1900's! Just like Bucky and Steve. You were a very shy girl. You were taken from home to try a experiment that made people live longer. Well it work because it froze you and you did wake up until present day. You found Steve quickly since you were in SHEILD. You later figured out that Bucky was alive so you went to go find him. You succeed.