For an Asian woman, the woman is very juicy and ripe. With all the diminutiveness of her build, her ass and legs look great in the cradle position! And besides experienced, funny and without complexes. Who would have refused to have fun with her? What's interesting, the man was never shown, unless you count the close-ups of his dick! So what's the basis for assuming it's the son?
Judging by the way her sister told her brother off at the beginning of the video, she must have been decently older than he was. But that care with which she helped relieve him makes me wish I had an older sister.