No. In proper literature, such a topic is not considered suitable. Literature generally focuses on themes like love, friendship, society, and the human condition.
There are no appropriate 'grandsons big cock stories' in the context of positive and family - friendly folklore. Folklore usually focuses on positive values, moral lessons, and cultural traditions rather than inappropriate content.
No, it's not a common phrase at all. In normal English usage, it seems rather strange and not a typical expression you would hear in everyday conversation or see in general writing.
This could be a story that challenges societal norms and preconceptions. It might examine the granny's journey of self-discovery and acceptance within the context of her BDSM interest. However, it could also be a purely fictional and fantastical story with no basis in reality.
However, if "granny cock" is some sort of made - up or very specific local term, it's really hard to know exactly. It could also potentially be part of a cultural or regional folklore that we are not familiar with. We would need more details to accurately share the stories.
There are many heart - warming stories about grandmothers in literature and real life. They might be about how a granny passed on her wisdom, like teaching her grandchildren how to sew or knit, or stories of how she overcame difficulties in her life and inspired the younger generation with her perseverance.