Incest is a sexual relationship between individuals who are closely related, typically family members. It is considered a taboo and illegal act in most societies.
Here are some examples of how "incestual" might be used:
* "The novel explores the complex and disturbing dynamics of an incestual relationship."
* "The film's plot revolves around an incestual affair that has devastating consequences."
* "The therapist addressed the issue of incestual abuse in the family."
It's important to note that using the term "incestual" can be sensitive and should be done with care and respect for the victims of incest.