I have been working on anal chastity. Any of the devices I have found online were too small for me and I could just easily pull them out.
This experiment was with a wooded bedpost top that measured 3″ in diameter. Since it was hard it would lock between my pelvic bones and was difficult, but not impossible to pull out. I have to mount it on a stand then lean back to get it in behind my pelvic bones. once in it can support ~15 lbs or more of weight.
Have any of you found an effective anal chastity solution?
???????????????????????
