There is more drama offscreen than on-screen with "Fifty Shades of Grey." The romantic movie based on E.L. James' erotic novels has succeeded at the box office, but now the sequels could be hitting some rocky shoals in the future. Disagreement between James and the film's director and writer could push James into writing the script for the film's sequel.

When selling the rights of her "Fifty Shades" trilogy to Universal, James negotiated greater control over the story than other authors previously, according to Variety. This authority led to disagreements with director Sam Taylor-Johnson and writer Kelly Marcel. Now, Variety reports James could be the one to write the movie's sequel, "Fifty Shades Darker."

Production for the second film has yet to start and insiders attribute this to disagreements between Universal executives and James. It is rumored both Taylor-Johnson and Marcel will leave the team to avoid further disagreements with James.

"The studio had always intended to sit down with the author after the film opened and discuss next steps, and that has not yet happened," a Universal spokesperson said.

Variety predicts production for the sequel will not start until early 2016, and the movie will not be released until late 2016 or early 2017. This is in part because the studio would have to factor in more time for revisions, as James has never written a movie script before.

The Telegraph adds the film's writing style could be different. If James does write the sequel's script, she will probably add phrases omitted from the first movie but prevalent in the books. Particularly Anastasia Steele's phrases like "holy hell" and "oh my."

According to the Mail Online, Taylor-Johnson will be leaving the franchise to avoid further conflict with the author.

"Sam won't be back for the Fifty Shades sequels. She wants out, and Universal knows that's the right decision," an insider said. "Her relationship with Erika has become absolutely toxic -- they despise each other and blame each other for the problems with the film."

If Taylor-Johnson is not involved in the sequels and James has greater freedom, it could also mean the movies could have more sex scenes, something the two argued over during production.

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