When handling breasts, especially large ones, don’t be rough with the area under the breasts. This underboob area, because it’s two sweaty areas of skin, forming a fold, constantly rubbing against each other, often gets chafed and irritated, even when cleaned often. This makes it particularly sensitive to friction, so if you’re going to be touching that area, be gentle, and stop immediately if your partner says it’s getting irritated. The larger the breasts, the more drastic the chafing is, and the more sweat accumulates in the fold. You may even be able to feel that that spot is sweatier than the rest of the torso.