Ahaha the Guardians are so prickly ("You're not friends." "No. We're family") all I can imagine is them finding something new to do together, or trying to teach each other things from their various cultures ("I am Groot?" "No, I am Groot") and it going south. Altho the idea of them doing karaoke is awesome -- hell, we already sort of got that with the scene of them singing along to "Rubberband Man," and Baby Groot soundtracking the fight at the start of G2. (And isn't Teen Groot playing one of Peter's old videogames in that stinger?) Kind of goes along with Tony teaching Nebula that paper football game at the start of Endgame, too....Maybe something like the bit in AoU where they all try to lift Thor's hammer? (that's what she said) (I can totally see Thor trolling people by leaving the hammer in front of the refrigerator, right by the sofa in a walkway....)

tl;dr KARAOKE FIC