As far as I can tell she only has a masturbation scene, if you fuck someone near the toilet stall she will go back inside and touch herself.
Viewing post in Help with Jiyon
With Kasumi as your assistant, go to the bathroom while she follows you and take the crystal ball with you. Then use it and as soon as it is destroyed, press X with Kasumi, wait for Jiyou to arrive. She will enter the bathroom and when she comes out, she will re-enter with another animation. Do not cancel the animation with Kasumi until Jiyou re-enters.