I dont think I could give you any tips, because different men like different things. What I can tell you is that pretty much all men are simplistic when it comes to cuming. As complexed as a woman is men are truly simple.
I know, as you being a woman and me reading your question you want to give him the best nut he has ever had in his life, and Im not saying that it cant be achieved, Im saying you kinda have to think more on the lines as a man, and not as a woman. So basically, you are thinking complexly, for a issue that is simple. With all that said, I would say if you are really into it, and really enjoying it (I mean really, really enjoying it, nothing fake) than he will be also no matter the actual act.
Another example would be, men are giving and the woman is recieving, so let him know when he is really giving it to you, and it will get hotter, but IT MUST BE GENUINE. Men get off on a woman getting off. Men dont like sluts, men like sluts getting off would be another good example. One more example would be, if the prettiest girl in porn laid a guy and had absolutly no reaction to him it wouldnt be a good lay no matter what, but if a regular old porn star laid a guy, and she was nutting every 10th second he would say she was the best lay in his life!
I dont know if Im clear with my examples, but hopefully it came accross well.
