Stories and characters, please. Solicit ideas/scripts from users if you don't have any ideas. I have a ton and I'm sure plenty of others here do as well.
I can see any number of body parts go into any orifice for free with one Google search. I get my money's worth with context, immersion, etc. Wankz used to be the kings of stuff like this but they've gotten a lot more generic in recent times. Look back at their Zombie Slayers series, or the multi-part saga with Casey Calvert. They did two Elena Koshka scenes that were vastly different but scratched that same itch, one where you are on a blind date and another where she's your girlfriend. The former actually had you sit through a full 20 minutes or so of the date before any of the action and the latter was one of the only GFE scenes where I felt like there was an actual relationship.
Build some tension. Make the viewer wait for it a little. Stuff like this is why cosplay scenes are so attractive. We have the familiarity with the characters built into our heads that are supposed to enhance the scene. I don't need an hour long epic but having a hot chick just walk up to me and hop on my dick is boring. I can also get that anywhere.
