The folks at BeAnotherLab are creating a way for someone to experience being another gender, using PlayStation Eye cameras and Oculus Rift headsets [http://www.themachinetobeanother.org/ ]
Large breasts are less sensitive than small ones. Stimulate the outer sides of her breasts, just below the armpits, with your tongue or fingertips. Make flipping motions with your tongue and even experiment with light nibbling.
