chastity device help?

Hi. My girlfriend and her bull want to put me in a chastity device. Which ones are best? Any suggestions? She says it will be used as a way of making sure I know my place in the relationship and won't be used all the time. We have been in a cuck relationship for a while now and have been wanting to do this. We are all in our twenties and continue to like the lifestyle so this is a natural progression. How does everyone else do this. Does she keep a key as well as her bull? Thanks.

with us the key is with my K/H and the other one is with her boyfriend..

very secure

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Stay locked in a NEOSTEEL MASTERPIECE "ARCH" at all times!