Big sis is great, big sis is fine
Big sis will make your worries disappear
Story 1, Big Sis: Art is forever, little brothers come and go
Story 2, Big Sis: Oh, am I not allowed to wipe this off?
Story 3, Big Sis: Help me up, I can still kiss him
Story 4, Big Sis: My husband will be sad
There are actually two more ideas, but I'm not sure whether to make them full-length stories or put them in a short story. One of the characters is an older brother.
Maybe I'll write:
Story 5, Big Sis: Mine, mine, it's all mine
Story 6, Big Sis: If you can't do it, then let's find someone else
Also featuring a completed story: a smooth-sailing, doted-on heroine in the 1980s
Theme: Spring has no age limit