Younger Sister, Little Sister
Who's that woman pretending to be a jet? That's my younger sister. *Sigh*
Imagine a little girl (your younger sister) running around with her arms out, pretending to be a jet, too. Prwoooooo!
まい
いもうと
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Your younger sister is giving some mice (まい) a ride on her back like a jet.
Ew, gross. Your younger sister is such a weirdo! Why does she have mice on her back while pretending to be a jet?