The Wrap is reporting that Olivia Thirlby is in discussions to join director Ivan Reitman's untitled comedy at Paramount Pictures, which stars Ashton Kutcher and Natalie Portman.

Previously known as Friends With Benefits, the film centers on a guy and girl who try to keep their relationship strictly physical, but it's not long before they learn that they want something more.

Thirlby would play Portman's sister in the film.