You copied her pose. "Oh yes baby, give me that ass. You are such a naughty girl." - you remind her of what you are.
"Oh? yes you are a "boy", let's see if we can make the best ou of.
Oh dear, I am so in love with your ass, makes me really jealous, I think even my boyfriend could not resist it."
What an awkward compliment, you acted as if you overheard it.
You told her to give you the next pose.