Ishi's body was screaming at her to do just what Akiko said.  Relax.  Follow the music.  Let her passion take over.  Stop being so uptight.  It took some time, and more than a few tail teases from Akiko, but Ishi's resistance eventually broke, and her body started swaying, her hips rolling.  The mirror was still there, on the wall, and Ishi saw that what she was doing was belly dancing.  That in and of itself was erotic enough, but doing it naked?  Plus having Akiko dancing in much the same manner around her, with the tail teasing various exposed parts of her body?  If it was Akiko's plan, then it certainly was happening - Ishi was starting to feel hot and warm again, her passions rising inside her.  Her core started to drip, her nipples began hardening into erect little nubs that proclaimed just how horny Ishi was to the other girl.