So the line I came up with is "I don't mean to be rude and I certainly don't want to be creepy, but (I gesture by bringing my hands up and cupping them around the breast area) are amazing." Then after she blushes and says thanks follow up with "I don't mean to be out of line, but would it be ok if I could have a feel?"
So what do you think? What do I need to tweak to make it work?