Im not convinced that you will stop at panties, once she accepts that and it becomes the norm, youll then start wanting the next step in your journey. Believe me it never ends until your fully dressed with makeup and going out shopping and meeting other girls at the lgbt clubs and pubs, it may take many years to get to that stage, but it a desire that is unstoppable. This is my opion because that what happened to me. and it all started with underwear.