The back door

My boyfriend and I tried good ole anal last night and I was definitely enjoying it at first and came.. after that though he kept going and it got more and more painful.. he kept the same pace and would hold on if I said to stop or slow down but I mean.. he didn’t get to get off.. I think next time we will have to foreplay more but I want to be able to finish him how he wants.. any suggestions on better ways to go about with having anal sex?