No. If the phrase is taken in a vulgar sense, it is definitely not appropriate for all audiences. It contains words that can be considered sexual innuendo which are not suitable for younger or more sensitive viewers.
Another possibility is that it's part of a fictional adventure story where a teen discovers a magical or strange object that is named 'huge cock' which has special powers. The teen then has to figure out how to use or deal with this object as part of their journey, whether it's to save their town or solve a mystery.
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.
If it's about a mom having a huge cat to bathe, it could be a humorous story. Maybe the cat is so big that it makes the bathing process quite an adventure, like it takes up the whole bathtub.
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.
I'm not sure specifically which 'huge cock story' you are referring to. There could be many stories that might use this phrase in a non - vulgar way, like a story about a large rooster perhaps.