just don't get put in a chastity cage, you can't put on a strapon because there is something on your Crotch Already.
the cage doesn't make your cock go away, it just makes sure you can't get erect. That's why you can't have one on without a cage, because you have a dick.
the whole point of a strapon is to give females a way to Perform vaginal and or anal. if you wanna use a strapon, be a Peach boy (A male with a pussy instead of a dick).
or ya know. . . be a female