Thank you for your detailed answers, I really appreciate it!
milkymilo She was belted at 17 as my aunt and uncle were worried about temptation for her as there were a few early pregnancies amongst her peer group.
Hmm - there are easier ways to prevent teen pregnancies, and even if a belt is the tool of choice, it would just work as well for that purpose without secondary shield, and/or with extended unsupervised breaks. I think it's rather obvious that the idea of this kind of strict belting is mostly to prevent masturbation. - Your cousin doesn't seem to have resisted a lot, if I got you right. Do you think she could have refused to wear the belt?
milkymilo as for my chastity we started with my cousins older fancy streel cable belt.
That is interesting - I'm not very familiar with Fancy Streel belts, but my impression from all the custom chastity belt manufacturers is that the belts are tailored to a single person, and are not very adjustable for various mechanical reasons. And there's little incentive to address this issue, as a belt that can be adjusted over a wide range could be used longer, or be re-sold, which would hurt the sales of the manufacturer. But I guess your cousin just happened to have a body shape very similar to yours?
And did your cousin really do horse riding with the belt? What model does she use? Telling from the pictures I find, I would guess the "dome shield" of your P1 would be a bit too bulgy to allow a comfortable ride.