One way could be 'There was a story about him and his mother which was wrongly worded as "knockedbup" and was inappropriate. It should be rewritten as something like "There was an event involving him and his mother that was misconstrued in a story."'
We could rewrite it as 'He had an unexpected situation with his mother' (but this is still a very general and needs more context to be truly appropriate as the original seems to imply something very wrong).
Another option is 'In a CBT story, no excessive dominance is allowed'. This rewrite keeps the focus on the CBT aspect and clearly states that there should be no extreme form of dominance in the story, which was what the original phrase was trying to imply in a rather unclear and inappropriate way.
We could rewrite it as 'Dad catches a boy (while he is) making up stories about his son'. This makes it more of a situation where the father discovers a boy creating untrue tales regarding his son.
We could rewrite it as 'The Story of a Rock - Hard Object and Its Transformation'. This way, we remove any potential inappropriate connotations and make it more straightforward and easy to understand.
We could rewrite it as 'The person/thing named Jerker visits once more'.
We could rewrite it as 'The story of a brother and sister's unexpected situation with a baby'.
We could rewrite it as 'Young Beach Adventure'. This way, it focuses on a more general and positive beach - related experience without any inappropriate connotations.
One way could be 'True story about a dog and a brother's strange situation'. This gets rid of the unclear and potentially inappropriate 'sex' part and focuses on the general idea of a strange story involving a dog and a brother.
We could rewrite it as 'She wanted his story'. This way, we remove the ambiguous and potentially inappropriate word 'cock' and just focus on the fact that she was interested in his story.
Another way could be 'too significant to be part of the given story'. This rephrasing makes it a bit more general and easier to understand as it removes the rather unclear 'anal' part which might be a misnomer or just a very strange addition to the phrase.
A more appropriate rewrite could be 'The Dhoka Narrative'. This title is more general and allows for the exploration of various themes within the story such as the human experiences related to the dhoka (betrayal) without any inappropriate connotations.