People, especially women, are different from each other and even different from one time to another as their moods change...
Some women like to have their breasts and nipples stroked quite gently but for others it is firmer handling that does the trick - even pinching or biting to the point of pain...
Some cannot bear to have their nipples touched under any circumstances...
Some need stroking to begin with and pressure to increase as she becomes more aroused...
Some women find having their twins petted is mildly pleasant while it drives others crazy and makes the vaginal juices flow by the gallon and sometimes they just aren't connected, but they could easily be very connected next time!
Until you know your lady well (or she tells you otherwise) you should treat her breasts the same way you would have her treat your balls - with gentleness and respect!
Finally, always remember a gentleman never refuses any reasonable request from a lady and don't forget your manners - if you had a nice time and she made a real effort to please you, say you appreciated it and thank her.
Even the most lowly can be kings and queens in the bedroom. Manners cost nothing and their use can pay large dividends!