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.
She's a blonde with a nice ass. You can't scare her with a big dick. Dude was lucky to get his ass in such a beautiful girl, it went like clockwork. The dude apparently got into the excitement and decided to shovel more sperm in her ass.