I'm making these up:

-James, Remus, and Peter give a dog bone, a chew toy, and a dog bowl with 'Padfoot' inscribed on it for Sirius's birthday.

-Lily wanting to turn into Annanimagus after finding out about the Marauders but James stopping her and saying "the Marauders aren't accepting any members at the moment. We'll probably never accept anyone else in our club."

-Lily getting mad at James' hypocrisy when he let's Fred join after they all die.

-Lily and James shipping Tonks and Lupin, and Sirius getting angry when Harry thinks that Tonks liked Sirius. "Bloody hell James we have to tell your son not to jump to conclusions so easily. Tonks clearly fancies Lupin."

-When George joins Fred after death, they hug and doesn't let go until Fred whispers "Mum, Dad, Percy, Charlie, and Bill Fleur are hear too". And George runs and hugs all of them because he hasn't seen them since for so long. After a few years, Harry, Ginny, ️Hermione, and Ron join, and they have a happy reunion and watch over their kids.

-Fred and George (before Fred's death) writing love letters from Charlie to Norbert and showing Mrs. Weasley. Mrs. Weasley crying about how that's beastiality when Charlie comes home for a while. It ends with Fred and George getting their arses beat because of the joke.

-️Hermione and Ginny having girls' night out in the muggle world while Ron and Harry watch the kids. Ron and Harry not being able to handle the kids and calling them in the middle of their pedicure.

-Ginny and Harry drawing mustaches on eachother, depending on who wakes up first.

-️Hermione reading muggle fairytale while Ron corrects her. "And the fairy god mother changes the pumpkin'". "No Hermione! It's a witch who turns the punk in and then it turns out that the witch was evils and-" "Ron!

(I might do a one-shot of that ^^)

And that's all I've got.