Her mouth was doing a great job on his cock! As for me, I would limit myself to the mouth - so relaxed to myself and catching a buzz. If even a gulp and lightly massage his lips after that - full flight! I love it when a woman can work with her mouth. And on the second run, you can already fuck her!
Everyone has their own way of persuading to do something, and sex is a very original option. The important thing is that the father was able to talk his daughter into learning, and the contact brought satisfaction to the couple.