"Why" narratives in chastity play

I’ve come across several fantasy narratives in stories and captions that provide a compelling ‘why’ for why the woman wants to keep her man locked, adding extra flavor to their dynamic. These include: []He’s too small, so he needs to be kept caged []She is a hotwife who keeps him secured while she dates someone else [*]She aims to break his will and ensure total obedience by never letting him out I believe that in many (most?) of these situations, it’s really just a fantasy—a story people layer onto the practical game to make things more thrilling. For instance, the blogger at keephimcaged notes they practice sph because it excites them, not necessarily because she believes it reflects reality. What other such fantasies have you noticed layered onto chastity? My wife seems slightly unsure about locking me up, and I’m curious if we can find a motivation like this that would appeal to her. I want to compile a list of examples to show her, hoping we might click on something she likes. Currently, she locks me primarily because I enjoy it; as soon as I complain about being let out, she quickly says, “oh ok”. I’d appreciate help finding a different ‘why’ that empowers her to say, “no, I need to keep you locked because…”. Simply telling her I don’t truly mind unless I use my safe word hasn’t worked—she’s too caring and worries that locking me up causes pain. She has found she loves T&D without the cage, but the concept of using a cage still escapes her.