You and the model with whom you are paired (or models, if that is the case) should get the concept of management's expectations of the scene then talk through how far you want to go in achieving the goals stated. Watching David and
Zeno Kostas or David and some of his other partners just "go at" the scene has produced some of the best pure, passionate, taking care of business and each other, videos on the internet.
Go with that. Get your boundaries set but keep your horizons open as you approach the scene. Do what you would do if you two decided to "experiment" with each other if you met at a club or bar and decided to have a go at each other so you take him home and just do it. The more natural the scene, the more fluid it is - the better it should come across (in spite of the fact there will be cameras rolling).
And, if you are going to kiss - cut the noise (seems to be used to make sure the viewer knows models are kissing, but seems fake to me.) If I'm into a partner and kissing, I am checking out their fillings and tonsils with my tongue. They do the same in return. There isn't noise involved. Maybe a little spit moving back and forth, but no noise. God, I find that noise so irritating!
Good luck. Love your scenes. Just don't do it for "show". Do it for the money and do it for your admirers who want to see you get off but also to see you make sure the model with whom you are paired is not just used but gets something out of it too. Make sense? Perhaps the suggestions are too one-sided (for me) and would be the most awful thing others would ever want to see...
If I am overstepping any sort of boundaries about expressing ones self on here, just PM me with STFU (shut the fuck up) and I will.