This time… focusing on Acrylic Chastity Devices.
The CB
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Clear Devices are an Option. To help hide while you’re changing at the Gym.
Or maybe Shiny Silver will be locked onto you by your SIR to embarrass you… to make you even more concerned someone will catch a glimpse in the locker room.
Or maybe SMOKED/TRANSPARENT? A combination of the two… 
How about WOOD for your Wood?
No Hiding your Erect Cock with this…
Whatever Color or Device is locked onto you… Be Proud, boy.