He takes her as a genie!

"Hey, can you form your lady parts on your tail?" Natsu asked Lucy, who blinked.

"Actually, yes, so long as I have your permission at least... would you like me to?" she asked him curiously, a twinkle in her eyes.

"...yeah, that sounds like a fun thing to try," he remarked, and without needing to be told twice, Lucy let her legs melt back into tail form, then held her hands over where her pussy would be. When she removed them, the mist there had shaped itself into the folds of her womanhood, though remaining violet.

"Ready, Master~!" she told him with a wink. He immediately approached her, and grabbed her wrists, walking her to the wall and pinning her to it. Her tail ended up between his legs, and she moaned as he leaned in to kiss her. She wriggled her wispy hips, and returned the kiss.

The tip of his cock poked her folds, and she whimpered in longing. That was all the invitation he needed to plunge his dick right into her pussy, and he buried himself into her to the root. Her hands, held over her head against the wall, tightened into fists as she writhed in delight. He began to slowly fuck her once again.

She rubbed her body against him, murmuring happily into the kiss she was maintaining, her lips parting, a muffled invitation for his tongue. He accepted it, and slid his tongue into her mouth, and sped up slightly as she sucked on it. "Mmm, so hot, Master..." Lisanna, still in Cat Girl form, purred as she got behind him, and rubbed his shoulders with her paws, claws retracted of course.

He broke the kiss, and smiled at Lisanna. "That's kind of the point of a Sex Genie, isn't it Lucy?" he teased his blonde genie ****.

Lucy bit her lip and nodded. "Yes, Master, very much the point... please, don't stop!" Natsu obliged, pounding harder into her, plastering his chest against her boobs. She squirmed in needy pleasure, and he kissed her neck as they both approached release. "Yes, YES! CUM INSIDE ME!" she cried out.

He grunted, and his cock erupted in her pussy, emptying itself into her depths. Her back arched as much as she could while she was so thoroughly pinned by his body. "...I don't think I could ever get sick of this," he admitted as he panted, pulling out of her.

"Me neither, Master..." Lucy wheezed, slick with sweat.