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.
A possible rewrite could be 'The Tale of a Solid Element and Its Alteration'. This rewrite gets rid of the words that may be considered vulgar or unclear. 'Solid element' gives a sense of something firm like the 'rock hard' part, and 'alteration' can represent the 'tf' (transformation) in a more appropriate and understandable way.
One way to rewrite it could be 'A Story about a Firm Thing and a Strange Change'. Here we replace the words that might cause confusion or be inappropriate with more general and acceptable terms. By using 'firm thing' instead of 'rock hard cock' and'strange change' for 'tf', we make the title more family - friendly and easier to comprehend.
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 'The person/thing named Jerker visits once more'.
Perhaps it was meant to be 'The girl had a couple of stories' which is a much more common and understandable phrase.
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.
We could rewrite it as 'Big event disrupts wife's story'. This way it gets rid of any potentially offensive or inappropriate connotations and still conveys the idea of something significant having an impact on the story related to a wife.
We could rewrite it as 'The story of a brother and sister's unexpected situation with a baby'.
We could rewrite it as 'Girl pleads with guy to do an unappealing task story'.
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.
If we assume 'cock' is referring to a rooster, it could be 'Mom measures my young rooster.'
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).