X-Ray Machine is not an organ prop that can be added to your female character, it needs to be used independently. It can 'shoot' the movement of your penis props in vagina and womb like an real x-ray machine. With X-Ray Machine, you can create a still frame, or an animation. Then you can composite them into your comics or animations in the post-production process for more fun.
Please note that the womb and vagina in X-Ray Machine are not anatomically accurate, the images and animations produced with it are biased towards Japanese anime styles. There's a detailed user's guide to explain how to use the X-Ray Machine and what it can do.