Your tasks:
1. Get comfortable between his legs or beside him and move around as needed.
2. Follow the prompts of the movie. Give him what the movie tells you and follow your intuition where needed.
3. Start very slowly and concentrate deeply on his reactions. Your goal is to bring him to the edge of orgasm and hold him there as long as possible. Use enough lube.
4. If you notice the first white sperm immediately jerk him off really hard and start anal milking his prostate until his orgasm is completely over. This may take longer than you expect. Now he will have realized that he has lost the game and can give up any resistance.
5. Now your goal is to give it to him as often as possible till the movie ends and until he is completely milked dry and satisfied.
6. Anytime his penis gets soft, fuck his prostate harder or give him a good sucking.
7. Enjoy satisfying your man completely.