Milk and Juice

Kes sometimes let me pretend to suck her thumb (I put my closed mouth on the closed-fist non-thumb end of her hand and move my chin). She prefers for me to have the right hand (which she never sucks), which she calls "milk", while she sucks her left thumb, but occasionally when she is feeling generous, I get to have "juice" and pretend to suck her thumb while she is sucking it. This started as a silly game when I once joked, "can I suck that thumb?" and has become a bit of a routine.

Tonight, as I was about to get up from her bedtime cuddle, something new...
Kes: "Wait, Mommy. Do you want some milk?"
Me: "Sure, thanks!" (pretends to suck on the closed fist)
Kes: "Oh, just a minute. I have to fill it up." (puts her hand on the right side of her chest) "Here, it's ready."
Me: "But can I have some juice?"
Kes: "Sure!" (puts her thumb in her mouth and moves her head toward me)
Me: "So where do you get the juice?"
Kes: "From my left nipple."