I have a big labia but I do want the front shield with the oblong hole in order to use the vaginal-dildo because my master wants it

If you as a woman would like to wear a chastity belt and your master insists on having vaginal-dildo integrated, you have to take the front plate with the oblong hole. But if you have very large labia and you want to stick those through the oblong hole of the front plate, you have to require attachments in order to protect your labia. You can use this kind of “labia-protection-attachment” whenever you’re not using a vaginal-dildo. It prevents from getting your labia jammed in oblong hole of your front plate.

The “labia-protection-attachment” is provided with bores, so that your urine is able to flow safely though in order to prevent a jam.  Therefore you have both options: the front plate with the oblong hole for the use of vaginal-dildos and a labia protection for women with large labia.