Oral Fixation.

"Well, let's go with another trigger," he mused to himself. "Oral Fixation."

Lucy immediately felt odd like... She needed to put something in her mouth. Her mind immediately supplied Natsu's cock, but she vehemently rejected that idea at first.

"So..." she said, fighting the urge to go blow Natsu, going to get her water. "Any decent missions expected to show up on the board?"

"How should I know, I just wait for something to show up that interests me, same as anyone," Natsu remarked.

"Worth a try," she sighed, drinking a gulp from the glass, and holding it in her mouth. It provided absolutely no relief, the emptiness in her mouth was only getting worse, and she just swallowed the water in a disappointed manner, shaking her head as she tried to shake off the feeling, but that obviously did nothing.

"What kind of jobs do you normally do?" she asked, licking her lips as her gaze flicked to Natsu's crotch.

"Eh, the standard, beat up some bandits, clear out some monsters, retrieve some kind of item, bodyguard some guy," Natsu ticked off on his fingers, grinning as he watched Lucy momentarily space out and bob her head with her mouth open on empty air. "Occasionally I get something really unique..."

She snapped out of it, and said, "Ah... Like that job to take out that phony Salamander..."

"Nah, that one was a personal matter," Natsu replied, wondering how much longer she'd last.