You and Steve have a past together, he loved you but never had the guts to tell you, now you've run into each other once again

You're a super soldier, probably around Steve and Bucky's age, this is your second mission as an Avenger, you've just finished it and it's raining

Steve grabs you by the waist and pull you close"... God... You're so pretty..." After a few seconds of silence he says the words he's wanted to say for so long "... I love you..."