His grandson is already old enough to fuck his grandmother

She saw how the bad guys came to her town and did what they wanted with the women. She overcame that and then went on with her life and that new trend she appreciated called progress. She adopted it and also used it. Once she was able to navigate the world, she discovered that time passes and that there is nothing she can do to change it. However, at 60 years old, she is an expert at fucking. Her own grandson can see it in person while she gives him a blowjob. When he can fuck her pussy, he understands that old school rules when it comes to incest.