“Hold still,” Barbara says, finishing a braid in your hair. “There. You look so cute.” She squishes your cheeks, peering over your shoulder to look in the mirror. “No one’d guess we’re crime fighting vigilantes in our free time.”

Barbara isn’t just your older sister, she’s also Batgirl. You’d discovered her secret identity when you accidentally walked in on her sneaking back in through the window, and only agreed not to tell your dad if she let you join her. Then you’d become Batgirl and…