Probaby not too deep, but not a very rewarding theme. You'd have to figure out why she's bent that way, probably using flashbacks to describe whatever whoever did to her, and it would distract from the main story, which would be tedious to give an ending without falling to sappy "romance heals" stereotype, abd by now really noone can digest that anymore.
And all the time you still know next to nothing about her, or her relations to others, or events of her life, so you don't have anything but a name to base a character upon.
For example, what would you make her DO in the fanfic? With whom? Why? What obstacles are to be overcome? Is it about sex? Relations? Fetishes? Sensei's anus? Maybe her secret love for the storyteller guy, so she can burn down the libary?
Give me just a few words direction about the story that doesn't suck it hard and I might write it.