Renita Well, if the bike caused undue stimulation, it was my fault, not hers.
Generally, I find that chastity is the keyholder's responsibility from the moment the lock clicks shut. The keyholder ideally chooses and adjusts the belt, adds accessories if and when necessary, and supports the wearer's safety and wellbeing.
If I'd expect 100% self restraint, self denial or discipline from a locked girl, I would not bother her with a belt. So if she chooses to explore her options while belted, I cannot hold it against her. If she gets closer to success, I have to get better in protecting her. But I can't expect her to share my responsibility.