New idea hot off the press: sneaky sex on an airplane.
Start off in your seats with some hj/bj action, of course having to dodge and hide from the occasional stewardess or passenger walking down the aisle. Then moving into the bathroom for some standing doggie & missionary.
Maybe she (your seatmate) is an escort and always looking to make a few extra bucks. I occasionally enjoy nsfw audio and this one with that basic plot has always been a favorite of mine: https://old.reddit.com/r/gonewildaudio/comments/eutaqp/f4m_your_flirty_seatmate_is_an_escort_parts_1_2/
How to film this? Good lord I have no idea. But I know it'd fall into that category of "things I've always wanted to do" and thought about pretty much any time I'm on a plane.