Have her make dinner and some more fun. Foreplay is pretty fun!

"Alright Mira, you can stop," Natsu said, and she paused... Before resuming. Natsu was bemused a moment, before realizing his tone and wording had only implied she had permission to stop, not that he was ordering her to. And of course, with her eager to obey, she preferred not to unless it was an order. "Let me rephrase that, Mira, stop," he said, and she nodded, pulling off his fingers, panting as she exuded contentment. "Lower your skirt too," he added, and she let it drop.

"Can I serve you in another way Master?" she asked brightly.

"Yeah, I'm kinda hungry. Go ahead and make us some dinner, and make sure you set some aside for yourself too," he ordered.

"Of course Master, what would you like?" she asked him.

"Anything's fine, long as there is some kind of meat in it," he grinned. "Just no candy." (Looked up Natsu's preferences for this, lol.)

Mira nodded and quickly skipped to the kitchen, Natsu watching her. About thirty minutes later, she came back with chicken and rice on a plate, and presented it to him. "Good girl," he grinned, making her blush and smile as he wolfed the food down, and she went to eat hers.

Once both were done, she brought him a second helping. "Well, you read my mind," he chuckled.

"I'm well aware of your appetite Master... I'm full, so the rest is yours," Mirajane said proudly.

"Good. But while I have my seconds, get down on all fours so I can rest my feet on your back," he ordered, finding Mira doing something like that funny. Plus, he knew she was eager to serve right now, might as well let her have some more fun.

"As you wish Master," she said, quickly getting on her hands and knees, and gave a happy sigh as she felt him put his feet on her back. He grinned and got to eating the second helping.

Once he was done, he set the plate aside, and said, "Alright, stand up, then we can move onto the real fun." He moved his feet off her back, and she stood, anticipation in her eyes. Natsu grinned as he considered how to start the actual sex, knowing they were both enjoying this little roleplay he'd made.