Peaches, there are no exercises that will enlarge your breasts.
There are also no devices, creams, lotions, powders, pills or anything else which will make your breasts larger than they are genetically programmed to be.
You can, however, do exercises to strengthen the muscles in your chest wall, which may make your breasts appear larger due to a firmer body underneath.
In the meantime, you can either learn to be happy with what nature gave you or you can look into surgical augmentation (a boob job) or perhaps invest in a nice padded bra.
Good luck.