How about you keep your pussy clamped under clothes. If you have movement work you can plug in a marker ir two to make your asshole fucked with your movement.
Perhaps a permanent wedgie, where you attach string through your knickers and over your shoulders to keep it in place. It's rather uncomfortable, especially of you have to bend down to pick something up I suppose...
Please do not go sticking a marker in your asshole for long term inserted wear. There are too many safety risks with that. Don’t use anything that’s not captured some how by string lanyard or by over size stop like on a butt plug. No one here will be paying your ER bill when you have to get it fished out or when you hurt yourself.