About this scene
Mid-day grocery store parking lot, half full. They're parked in the second row from the entrance with both windows half down. She's on top, he's reclined in the driver seat, and the seat belt warning has been chiming for almost the entire clip. Two cars pull in on either side over the course of ten minutes. Neither of them slows down or repositions. He finishes inside without pulling out and she stays seated for almost a minute afterward, breathing slow with her forehead against his.
What to watch for
The seat belt chime is the timekeeper. Count the chimes from the moment the cars on either side park. They go through eleven before either of them moves. The creampie is on camera, not implied. She lifts off slow, you can see the finish, and then she sits back down on his lap for the comedown. Her hand reaches for the door handle once and she pulls it back. She wasn't ready to leave the car yet.