Definitely inappropriate. Minors are in a stage of development and should be protected from any form of sexual content. Preteen sex stories in fiction can have a negative impact on the perception of children and society's values regarding the protection of minors.
Preteen sex stories in fiction are completely unacceptable. We have a moral obligation to safeguard the innocence of preteens. This type of content can also contribute to a wrong and harmful view of children and their vulnerability. It has no place in literature or any form of media.