I saved a piece for you
Bucky wonders how the others explain his never being at the compound to themselves. He's heard Natasha joking that he must have a huge number of hot dates, Sam seconds that guess, he knows Wanda only cares that she can't read his mind and Stevie just keeps giving him a sad disappointed look.
Bucky has finally stopped caring. When he's visiting Stark Tower he's happy and that's all that matters.
“You guys finished without me,” Bucky says sadly when he gets up to the penthouse and sees the finished jigsaw puzzle on the coffee table.
“You told us to start without you while you ditched Captain Leotard. It's not our fault we're made up of three doctors, a half alien whatever who grew up in the time that literally invented the family jigsaw night, a God, and the King of all puzzles,” Tony says and Rhodey beams.
“Besides it's not finished yet,” Bruce says pointing to the single empty spot on the puzzle.
“I saved a piece for you,” Quill says and hands the piece to Bucky who smiles appreciatively and presses it into it's spot.
And, when they pull out another puzzle for them all to do together, Bucky has never felt happier.