You cannot make your breast larger, only the pectoral muscles behind your breast. The same muscles men have on their chest. Use caution when preforming the "I must, I must" exercise or any massage that stimulates these muscles. While they can enhance your size, slightly, and make the perky they can also take over, and make you more flat chested.
Oh, and so you know, yes men like to stare at big breast. If you want any respect in life, be glad you don't have them.