Well, me being me, I love the fact about keeping her gender a secret and she's smart xD oh! And also because of the storyline so far, it's great ( amazing ). Honestly, just keep writing how you like and see how it goes.. I'm sure it'll go well! After all, you're awesome and so is your story~
P.S. I HAD A FEELING THE AUNT WAS GONNA BE EVIL!! (゚д゚lll)