And why would the grandfather resist? When else would he have such an opportunity. Besides, it's always easier with a temperamental woman - she gets herself turned on and therefore comes much faster. You would have tried to bring to orgasm phlegmatic fat girl with a huge hollow. That's the kind of woman you should run away from. I've been in the middle of one of those, you can't wish it on the enemy.
It really is a paradox of nature - how does she manage to swallow a cock that is clearly too big for her mouth? Even more unbelievable how she manages to fit such a big dick in her front with such a fragile build! That's mystifying!