It's good to see another mother and son who are relaxed and natural together. For me, the key was good grooming from an early age - it takes the weirdness out of nudity and physical contact and we can be familiar and relaxed together. My son and I have enjoyed many movies together while he fucks me from behind - it's one of my favourite relaxations. (I let him cum inside me, i won't get pregnant)
my wife wears only minisqkirts&holdups and she does the same thing,cuddling up in sofa watching tv,and it,s so kinky,i see her wiggling her ass in his lap,on one occasion he couldn,t hide it ,and then i came in my panties without touching myself