Try Gemini next!

"Think we still have a little more time before Erza shows up with breakfast, and I doubt any of us would mind if she walked in on us anyway," Lucy noted. "So, you wanna try out another spirit, Master?"

"Yeah, I do," Natsu grinned, before looking at Lisanna and Virgo. "You two go ahead and have some fun with each other."

They nodded, and immediately turned to start making out. Natsu took a moment to watch them kiss and caress each other's body, and then turned to Lucy. "So, which one next, Master?"

"Well, just like I wished for the most suitable and got Virgo, I'd like to wish for the next most suitable one, to be Summoned," Natsu nodded.

Lucy nodded enthusiastically. "Granted!" she replied, snapping her fingers, before whipping out the key she learned was next best. "Open, Gate of the Twins, Gemini!"

The duo of spirits appeared, and immediately greeted the two. "Hey, Lucy, Natsu, what's up, piri, piri?" the sprites asked.

"...oh, that's a great one," Natsu admitted, already imagining two Lucy's giving him pleasure. Lucy giggled.

"Yeah, they aren't shy either, they've always been up for some fun. Actually, they were only barely passed over for Virgo the first time..." she stated.

"Oh, you're going to actually use us for some twin sex now?" the two Gemini sprites asked excitedly, apparently already into the idea before things were even explained.

"Yes, yes we are," Natsu and Lucy nodded, before grinning in amusement at each other at how in tune they were.