You watch as her breasts swell 2 cup sizes.
“not fair, you shrink me and you get big breasts” you say.
“yes” she said as she rubs her new breasts.
You reach out a hand and grab her breast and concentrated.
“hay what are...” she said as her breast shrank down.
“what did you do” she said.
“payback” you say as you start to grow taller and she started to shrink.
She was now the same size as a little girl as you are back to your size.
“hay, how did you do that” she demands.
“now, now, little girls don’t demand anything form there older sisters” you say.
You take her hand and walk out of the mall as she screams that her plans have backfired.