I know a way, a little abusive, but effective. Wrap plastic wrap around your chest and do weight loss exercises. Although the water in the middle is lost, it does become smaller (which may cause redness, rash and allergies). Or do push-ups, the chest is stronger and smaller. But as a girl, I still think the former works well, because I am still feminine after losing weight. O (∩ _ ∩) O is expected.