It sounds like you have the same question I do I have treated my girlfriends breasts rather tenderly but recently discovered with the help of her guidance that she likes them mauled fairly hard but I went and visited her recently (we have a LDR) and I lay behind her with her back to my chest slowly cupping her breasts in my hands and softly rubbing her nipples with my fingertips they reacted incredibly stiffening and growing hard and she liked them being tweaked and pinched when they are at this stage try it it got me hot and her too judgeing by the way she thanked me