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.
Girls just shy away from sucking at first. Once they give a blowjob, all their embarrassment disappears. They begin to work on the technique of moving the hands, taking the cheek, dipping deeper and deeper into the throat. If the cock is not too long, they try to take it all in their mouth, to get their nose against the man's pubis. A little alcohol and she can already suck your friend's dick. It's a nice feeling when you mold a modest girl into a real bitch. Now for her to take cum in her mouth and swallow it becomes the norm. Gradually you get to her ass. After that, she no longer cringes if you treat her in bed as an available woman. It even turns her on.