I think his Nan/Granny gets off on it as clearly her grandson. As if didnt realise as ive seen other videos of the same guy masturbating in front of her and see glances over regularly. I bet she uses it as her wank bank, whilst fingering her clit and imagining her grandson emptying that spunk on her.
How is this scene set up and is she really that oblivious to him jerking off???? Does she enjoy watching him jerkoff??? It would be great for him to stand or sit aside of her and jerkoff or have her guve him a bk