Model B ( Bella Rush) is sitting down and then gets up to do something. (Preferably a couch). You then take her seat. Can you sit far enough back to where your thighs flatten out against the couch or seat (most important part).
She returns and you refuse to get up and tell her that she can sit on your lap. She then sit on one leg facing away from you. While you occasionally flex your legs, bounce, rock and hold her.
Can Model be sit on one leg facing away first (1/3 of the video), then after while switch to the other leg (1/3). And at the end sit on both legs (1/3).

I’ve always enjoyed your lapsitting videos and always wanted to experience a lapsitting session one day.
So for dialog: Something along the lines of how comfortable your lap is. How powerful and thick your legs/thighs are. An how people enjoy sitting on your lap. As well as how you enjoy people sitting on your lap.