From my POV I have some concerns about this. In my sitch WAW has recently been giving what MIGHT be interpreted as "I'm into you 'that way'" signals -- body language, for example, initiating frank sex talks, etc.
While I agree with Portland -- c'mon, this is sex we're talking about -- I have a lingering fear of facilitating and even encouraging cake-eating, AF. If she can "tap it" without needing to worry about consequences -- like abandoning her chosen course of action -- are you scratching the itch to your own detriment?