The show's current season saw the two develop a close relationship in the wake of Eric's memory loss, although the couple's future is now uncertain.
"This was the time for this roadblock where he gets his identity back," Woo told The Hollywood Reporter, regarding the show's latest episode. "The fun of it for the viewer, I hope, is to see how that affects the relationship they had established while he didn't have his memory."
"Now they've fallen for each other and the person he was when they fell for each other is now gone again. And whether they can last will feed their storyline at the end of the season."
Despite predicting trouble ahead for the new-found lovers, Woo also revealed that Sookie and Eric's relationship will remain centre stage on True Blood from this point on.
"As much as he sometimes hates her and as much as she sometimes hates him, he's always going to be under her skin for the life of the series," he added.
True Blood continues Sundays on HBO at 9pm.