Yup, It is called sexually arousing your by breast and nipple stimulation. You see, a good percentage of women, although not all women, experience increased blood flow and vascular congestion of the breasts when sexually stimulated by breast and nipple play. Some women can experience significant - although temporary increases in size exceeding a full cup size from sexual engorgement of the breasts. Hence, you see where people get the idea that it increases breast size but the gain is only fleeting. Once the sexual arousal ends and breasts will eventually return to the same size.
Now you are not going to hurt yourself by trying and I have massaged a couple of women who could orgasm form nipple stimulation if it was firm enough and continued long enough so suit yourself.