You're Bucky's girlfriend and Natasha is Steve's girlfriend. You all always hang out and go on double dates, almost acting like you all are in 1 relationship

you and Bucky are like the perfect couple for each other, you both are so madly in love and have no shame and embarrassment to show that in public, you both kiss, hold hands and laugh in public. But for Natasha and Steve, it turned out pretty much the opposite. They grew further further away from each other and one time it was just a massive bomb when Natasha almost kissed Clint in the training room

so one time you and bucky are just cuddling while laughing and kissing on Bucky's bed after a rough sexy time and bucky caress you're back lovingly while you both are naked, suddenly Natasha and Steve come in with a look of help on they're faces

Steve: "guys, we need you both..."

Natasha: "please tell us how ya'll are so perfect together."