Kensi and Deeks: it's the romantic pairing fans of NCIS: Los Angeles has been speculating about for years.

The two finally expressed their feelings with a kiss during the show's season 4 finale last month.

However, what is next on the horizon for these characters? For Deeks, it would be a torturous brush with Sidorov and a drill heading eerily towards his mouth.

The show's executive producer Shane Brennan has cautioned fans against speculating further about any development of the would-be relationship.

"It wasn't a candlelit dinner," Brennan told TV Guide columnist Adam Bryant June 11. "It was almost a challenge that he threw down to her. I think it surprised both of them."

Indeed, the kiss was followed up with a forthright Deeks declaring "How's that for communication?" after being long considered less than expressive.

However, Bryant suggested that the post-kiss torture experience may pepper the future of the Kensi-Deeks relationship.

"Deeks may feel differently about the kiss after his brush with death," Bryant finished his briefing on the show's upcoming season.

Brennan is also getting gearing up for a big NCIS: Los Angeles milestone -- the show will mark its 100th episode during the upcoming season and very early in it too. It will be the fourth of the new season).

Brennan is already prepared -- "I already know what the last episode is for next year!" Brennan told Matt Webb Mitovich at TVLine.com June 13-- but suggested that the 100th episode might take a different tack than the previous 99.

"[It] may play with the show's format a little," he said.

As for substantive news, Brennan also said that the episode will certainly "kick off an arc that runs right through the end of the season," one that would be a "watershed" for Deeks and Callen.

NCIS: Los Angeles will return to TV in fall 2013.

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NCIS: LA