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?
Marital sex just needs to be varied. If the couple won't do it together, then clearly they will still do it secretly each separately! I think this home variation is acceptable, in any case it is not as extraordinary as entertaining a large group of swingers. My wife and I once invited me to one of these, against her this clip is just sex puritanical family!
I'd lick their holes.