One possible fanfiction could be about Naruto visiting the Fairy Tail world and teaming up with Erza and Mirajane. They could go on a quest together to defeat a powerful dark wizard. Naruto's unique ninja skills would blend well with Erza's swordsmanship and Mirajane's takeover magic.
They could start by meeting in a strange, in - between world. Naruto is intrigued by Erza's armor and Mirajane's different forms. They soon realize they have a common goal, which is to find a way back to their own worlds. As they journey, they share stories of their past adventures, with Naruto talking about his battles in the Hidden Leaf Village and Erza and Mirajane sharing tales from Fairy Tail.
One possible fanfiction could be about Naruto ending up in the Fairy Tail world and teaming up with Erza and Mirajane. They could go on adventures together, with Naruto's unique ninja skills complementing the magic of Erza and Mirajane. For example, Naruto's shadow clone jutsu could be used in creative ways during battles against powerful foes in the Fairy Tail universe.
One great Naruto, Erza and Mirajane fanfic is 'The Unlikely Alliance'. It's really interesting as it combines the different universes in a very creative way. The characters interact in a believable manner, and the plot is full of action and adventure.
In fanfiction, the 'last time' could be a time of celebration. Maybe their guild had achieved a great victory and Erza and Mirajane were part of the celebration. Erza was probably still maintaining her serious demeanor but secretly enjoying the moment, while Mirajane was more openly jubilant, spreading the cheer among the guild members.
One idea could be a crossover where Naruto, Erza, and Mirajane are brought together by a powerful magic spell that goes wrong. They have to work together to reverse the spell's effects while also dealing with the differences in their worlds. Naruto's ninja skills, Erza's swordsmanship and armor changing abilities, and Mirajane's demon form and magic could create really interesting interactions and battle scenes.
In a more complex fanfiction, Naruto, Erza, and Mirajane could be brought together by a prophecy. The prophecy states that only by combining the power of a ninja from Naruto's world and the mages from Fairy Tail can a great evil be defeated. At first, they struggle to understand each other's ways, but as they train together, they start to blend their skills. Naruto might teach them some stealth techniques, while Erza and Mirajane show him how to better utilize chakra - like energy in their magic. This would lead to some really epic battles against the evil force as they learn to fight as a team.
Rather than seeking lemon fanfics, consider looking for ones that explore the deep bond between Mirajane and Erza. There could be stories about how they support each other during tough battles, or how their different personalities interact in the guild. These types of fanfics can be really engaging and are more suitable for a wide range of readers.
Growth is another theme. Writers like to show how Natsu, Erza and Mirajane develop their magic skills and as individuals over time. For example, Natsu might learn to control his power better, Erza becomes more strategic in battles, and Mirajane discovers new aspects of her magic.
A good fanfic in this combination should have well - written character interactions. Since they are from different worlds, seeing how Naruto, Erza and Mirajane communicate and work together (or against each other) is key. For example, Naruto's straightforwardness contrasting with Erza's more disciplined nature.