Anyone been in this foray? There's a pie nearby and she's acting as though she wants to be pied?

Unless you know for a fact she's got a WAM fetish, it's more likely than not that you're reading too much into the situation.

https://en.wikipedia.org/wiki/Occam%27s_razor

Uh, maybe she just wants to eat it?

Yes I have...Enthusiastic consent: Basically;

Ask if she does want to be pied,
Then again saying you will if she wants too.
THEN AGAIN ASKING IF SHE IS SURE AS IT WILL TURN YOU ON HIGHLIGHTING THE SEXUAL NATURE OF YOUR ACTIONS.
Then ask if she is still ok.

4 "yes's" and I would count myself lucky.