This, to me, looks like she has some subconscious knowledge of what he is like, or what he likes.
She doesn't know what he has been doing, but deep within herself, she does.
That includes both standing up and going all out to protect her and playing with her boobies like a monkey. So, a...
They're bound to find out eventually, and then they'll all be BFFs
Faking it is what got them to actually become friends with one another, which is very weird to think about