"Now don't you worry, we're not really turning you into a woman, we are just trying to make it so that you can breastfeed with real breast milk and this way should be faster and safer and certainly a hell of a lot less messy than what you're trying to do now. If you're uncomfortable in the clothes you can change back as soon as we get home."
"Oh my, what am I getting myself into now? This isn't going to give me big breasts that I can't hid from view is it? After all, I still have my own life to live and walking around with huge boobs isn't going to fir into my lifestyle. What would I ever say to my girlfriend or my Mom and Dad, if I ever see them again that is?"