Give me harder and stronger please, but don't end up inside! Sex with mature gym

She is a mature girl I met at the gym, we became friends and trained often, over time we started dating not only to train, but to get to know each other, one day I told her that I wanted to be her boyfriend and she told me that she liked me too, we kissed and since then we have not stopped almost every day, She is married and her husband knows nothing.