One year anniversary

So my boyfriend and I are celebrating our one year anniversary together this weekend. And I know we are going to have some naughty fun. I really want to surprise him for our anniversary, and do something new. We have already tried anal sex and rough sex. Does anyone have any ideas on something new that I could do to turn him on? He really wants to try orgasm denial on me, he said that would really turn him on for him not to let me cum. Do you think I should let him do it? Also has anyone ever done that, is it worth it?