I am on my cycle and my partner was sucking/biting my nipple and a very little white discharge came out. why? it looked like a small pimple were popped. on another occasion he was doing the same thing and clear discharge came out

This : This may be galactorrhea. Galactorrhea occurs when there are milk secretions from both nipples and it is not because of breast-feeding. The milk can flow spontaneously or with sucking or pinching of the nipple. There may be a tiny amount of fluid or a greater amount. This is abnormal if it occurs in a male but can be physiologic in a female. There are many medications that can cause galactorrhea. If it is only from one side, would recommend that this be evaluated.