Make it a double boob job.

He sighed in pleasure as he watched Cana suck his cock like her life depended on it, and Lucy pulled off his nutsack as she smiled at Cana and made her switch back with her. She met Natsu's eyes cutely as he began to pump his hips.

"Hey Lucy... How about using your boobs?" he suggested.

"Okay, sure!" Lucy grinned and sat up a bit more and stuck his dick into her cleavage without any resistance. She cooed as she got to work on working his shaft between her tits. Cana looked up, going whimpering with desire.

"Join her, and sandwich my dick between your two sets," Natsu moaned, and Cana eagerly nodded, straightening up as Lucy shifted to only have her boobs on one side of his dick.

Cana came in from the other side and both girls started working. Natsu pet both of their heads. Lucy moaned and lowered her head down to lick at his tip, pulling back to let Cana do the same.

They moved their boobs up and down his shaft in tandem, cooing as they did. It wasn't long really before Natsu felt himself throbbing, and grunted out a warning, and of course, neither girl moved away, allowing their faces and tits to get covered.

They panted, and Cana looked up at him. "...wow... Um... Mind getting me some paper towels for this?"

"Sure. Lucy, you go ahead and lick yourself clean," Natsu ordered, and Lucy couldn't obey quickly enough.

When he came back with the towels, he noted with amusement that Cana had licked herself clean along with Lucy, as expected. "...well, that was for nothing," he joked, putting the towels on the counter.