Steve: (thanks Haylie_Marie_ for helping me)
You two where on the couch cuddling when he looked at you and said "beautiful." You responded with "handsome" he said "gorgeous" you said "charming" and so on until he said "wifey" and you were confused until he held up a ring and said "please?"

Clint:
He called you into the training room to show you something. When you walked in you say him standing holding a single arrow. When you walked closer you saw the arrow said will you marry me on it. He handed it to you with a bow and pointed to two targets. One said yes one said no, you of course shot the yes.

Bucky:
While you two where decorating the Christmas tree Bucky asked if you could hand him the silver ornament with the red star. When you picked it up you saw it looked like his metal arm and there was a latch. When you opened it you saw a ring. You turned around and saw him on one knee.

Loki:
You where in a library when lol handed you a book and said "turn to the marked page love." You did and saw it was cut open and a ring was sitting inside. With a note saying "Be my queen?"

Thor:
He took you to Asgard to meet his parents. You where in the garden with frigga when she asked "when's the wedding?" You where confused and asked "what?" She said "you and Thor. I know he's been waiting to ask you." When you herd this you ran to find him. When you did you talked him, which made both of you fall you on top of him. You looked at him and said yes.

Tony:
He took you too his Malibu house where he made you dinner and walked in the beach after. In the sand he wrote "will u marry me? <3"

Bruce:
He took you out for dinner and proposed the old fashioned way. On one knee holding the box.

Pietro:
He took you to Italy for dinner, an opera in Australia, skiing in Canada, and finally you stopped in Paris on the Eiffel Tower. Where he asked.

Sam:
You were lying in bed together when he randomly said "we should get married."  You were half asleep so all you said was "sure." He started to shake you and said "I'm serious." That woke you up.

Wade:
You two were killing people when he said "marry me!" You yelled "what?!?" He said "marry me! (Y/n)!" You said later not realizing what you said. After you were done un-aliving them, he took you too Vegas where you got married.