What is the meaning of "intellectual treason" (al-khiyana al-aqliyya), and is the invention of a fictional character and marrying it off to another fictional character considered treason?

A woman should not think of anyone other than her husband, because it can lead her to become attached to others and make her less interested in her husband. It could also be a cause of problems and aversion between the spouses, leading to divorce and the dispersion of the family. If thinking of another man occurs while her husband is intimate with her, then it is forbidden. As for thinking of inventing a fictional character and marrying her to another fictional character, it is an absurdity and a waste of time. Writing about it is forbidden because it is a lie and a fabrication, and it could lead to corruption. A Muslim must busy himself with what benefits him in his religion and his worldly life.