Creator Andrew Marlowe has promised that Season 5 of his hit ABC show will explore Castle and Beckett in an actual relationship. The hot action that concluded the May finale was anything but a one-night stand.

But that doesn't mean all sailing will be 100% smooth for the new couple, as evidenced by this piece of Castle casting scoop:

According to The Hollywood Reporter, Jodi Lyn O'Keefe (Prison Break, Two and a Half Men, The Finder) will guest star on this fall's second episode as Kristina Coterra, an entertainment reporter who "shows more than a professional interest in Castle."

We can't blame the character, but we hope she's prepared to face the wrath of Kate Beckett if she dares make a move.

Castle premieres Season 5 on September 24 and this installment will be titled "Cloudy With a Chance of Murder."

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.