About this scene
Public bus, back row, late evening, no other passengers in the rear half. She's sitting next to him, school bag in her lap. The BJ starts at the second stop after the camera turns on. She goes all the way down without using her hands much, and her bag stays in her lap as cover. The bus makes three more stops during the encounter. Two new passengers board, both choose the front seats. She finishes him in her mouth and the swallow is on camera before the next stop announcement.
What to watch for
The bag is the cover and the timer. It stays in her lap the whole time, hiding the angle from any passenger who might walk down the aisle. The bus PA announces stops at thirty-second intervals, which is approximately the ambient pacing of the encounter. Listen to the audio when the new passengers board. The doors hiss, footsteps come up the aisle, and she does not slow down. The swallow happens between two stop announcements and you can time it almost exactly.