Ai, if she remains human is going to fairly sexual repressed and hesitant to physical touch. After a half decade being trapped in the body of a Succubus and given a chance to not be like that, she well. Is running away from being sexy. At all. She'd much rather be frumpy.

Even if she's returned to being a succubus, she's going to be extremely bitter. Yuri split her when she got used to her life being like this, and having the choice, she'd rather never be a demon again.