No, it's not a common expression at all. It's a very strange and rather inappropriate - sounding combination of words that you wouldn't typically hear in normal conversation or in general language use.
I'm not aware of any so - called 'big cock jock stories' in a specific sense. But there are many famous stories about athletes. For instance, the story of Michael Jordan, his competitiveness and drive to be the best in basketball is quite renowned.
In ancient myths from various cultures around the world, we find stories about the afterlife, the relationship between humans and the divine, and how to live a virtuous life. There is no room for such offensive 'guy sucks cock stories' as they go against the very essence of what ancient myths were created for.
I'm not aware of any positive or appropriate stories with such a vulgar concept in mainstream literature. Literature usually focuses on more positive, moral and inclusive themes.
Rather than delving into such inappropriate stories, we should encourage a society that promotes love, respect, and positive interactions within marriages. There are so many wonderful aspects of married life to focus on, like mutual support and shared dreams.
Sharing or promoting such sexualized and inappropriate stories is not acceptable in a respectful and inclusive society. We should focus on positive and respectful topics regarding the LGBTQ+ community, such as their achievements, equal rights struggles, and contributions to various fields.
I'm not entirely sure what you specifically mean by 'big cock jock stories'. But if we think about stories related to jocks, there could be ones about their team spirit. For example, a group of jocks on a struggling team worked together, practiced hard every day, supported each other during tough games, and finally turned their team around to win championships. Their leadership, mutual respect, and unwavering dedication are all elements that make these stories interesting and inspiring.