As an update, we're working on being a lot more communicative about things that feel good or bad, and while she was sucking me off yesterday I was grabbing her ass pretty hard. She was making some noises and I wasn't sure what she was feeling, but she told me that "it hurts but I kinda like it" which sounded pretty good to me ;) Makes me think she's definitely be into the edging when the time seems right to bring it up, as well as potentially exploring some light bondage/restraint play. Perhaps she just needs to figure out the things that get her imagination going