Responses
I don't think she meant she wants to remain as his slave though. She kept the collar because it's a memento that brought them together, but there is no binding force in the collar to counterpoint her own will anymore. She can leave at any moment if she wants to. At this point the collar is pretty much like any BDSM kink toy. It's a bit weird, sure, but who are we to kink shame?
this was good until the elf became "slavery is a choice uwu"