Definitely not appropriate. Family relationships are based on love, respect, and appropriate boundaries. This kind of description involves extremely abnormal and unethical behavior. It is not something that should be part of any story or real - life situation. We should uphold positive family values and ethical standards.
First, if it's just a stupid joke among peers, you can have a conversation with those involved about appropriate language and respect. Tell them it's not okay to use such vulgar terms in relation to your son.
Well, if not in a vulgar sense, 'huge cock' could potentially be a misnomer or a very strange way of referring to something large. Maybe it's a big rooster on the family farm that the stepmom has some sort of story related to. But this is a very odd and uncommonly used way to phrase it if not being inappropriate.
Well, without more context, it's hard to say exactly. It could be that there is some sort of object or situation that has been misnamed or misrepresented as a 'huge cock'. Maybe your son has a large - sized item that someone is joking about in a very improper way. But we should always be cautious of using such vulgar language when referring to children.
It's completely inappropriate. A mother should be a role model in propriety. Such stories are not only improper in terms of content but also may make the friend's son feel uncomfortable or even exposed to inappropriate information. It's much better to engage in conversations about things like sports achievements, cultural events, or recent interesting news.
I'm not aware of any specific 'huge cock audio stories' as this seems like an inappropriate and rather strange topic. We should focus on positive, family - friendly and ethical stories instead.