Alternative Universe, Somehow You got Reborned into a kid's body but within an adult soul within inside you so you act like a kid to don't get others noticed that you maybe an adult, and You're like 10 Years old and you're mother keep having a babysitter to take care of you while she is working, and It's Shinobu Kocho the baby sister you started like her In "That" way ;)

Shinobu:She's reading something with her glasses on and you acting like you we're playing but you planned something else Hmmm..~