Lucy makes Erza lick her.

"So then," Lucy grinned as she pulled down her panties, and loincloth. "How about you lick me, Erza?" she asked as she sat on the floor, and parted her legs.

"Yes, Ma'am!" Erza nodded, dropping onto all fours and crawling over to Lucy. She then lowered her face towards Lucy's labia, and extended her tongue to lick at the genie's nether lips.

"Mmm, yeah, that's it, Erza, you light quite the fire in my loins..." Lucy crooned as she moved her hips up towards Erza's face.

"I aim to please, Ma'am!" Erza replied, fingering Lucy's snatch next to speak. "...can I try the dominatrix outfit on you next?" she then asked.

"If Master doesn't have an issue with it!" Lucy nodded, even as Erza dove face first back into Lucy's crotch, wriggling her tongue into Lucy's pussy, running it against her vaginal walls. "Mmmnh..." Lucy crooned.

Deciding he wanted to make things even better for Lucy, even as Lisanna gently stroked his semi erection with a hand as they watched, Natsu wished, "I wish Erza had a natural instinct for where your most sensitive spots were."

"Oh, thanks, Master!" Lucy nodded, snapping her fingers. Almost immediately, Erza operated with a lot more confidence, licking more forcefully and eagerly, hitting Lucy's sweet spots and making her pelvis writhe.

"Mmmph!" Erza moaned as she licked with abandon, gripping Lucy's thighs.

"That's it, good girl, I'm cumming!" Lucy cried out as she arched her back, her climax rippling through her body as her tongue lolled out. Her hips quivered against Erza's face, before the tension exited her body, and she relaxed as Erza pulled back.

Erza then looked at Natsu, who was once again fully erect, but Lisanna was still being slow with her strokes, making it more of an idle thing as they watched the fun. Natsu had started to return the favor with fingering Lisanna's folds. "So, Sir, how about letting me dominate your genie for a bit?" Erza asked hopefully.