Her relationship with Natsu would likely change. Natsu might be initially distrustful of Lucy if he senses her connection to End, since End is often seen as an enemy. But then as he realizes that Lucy is still the same person deep down, their bond could become even stronger as he helps her control this new aspect of herself.
With Erza, Erza would be very cautious. She is always about protecting the guild and if Lucy has a connection to End, Erza might keep a close eye on her. However, as Lucy shows that she can handle it and is still on the side of the guild, Erza would gradually accept it and their relationship could develop into one of mutual respect in a new way. Erza could even help Lucy train to control any new powers related to End.
The guild as a whole would likely mobilize. Erza would start formulating a strategic plan. She'd consider the strengths and weaknesses of Acnologia and figure out the best way to approach the situation. Gray would also be ready to fight, using his ice - make magic to support the rescue mission. They would all be united in their determination to get Lucy back safely.
She would fit in very well. The Fairy Tail guild is all about family and acceptance. Given her parents are Lucy and Natsu, she'd be welcomed with open arms. She could learn from the older members like Makarov and Mirajane, and bond with the younger ones like Romeo. Her magic skills would also contribute to the guild's strength during battles or when helping the town.
In terms of her relationship with Gray, there could be a new dynamic. If'si' reincarnated as Lucy, she might be more competitive with Gray, which could lead to some interesting interactions. Her relationship with the celestial spirits would also change. She could become more like a mentor to them, teaching them new things from her past life or experiences. Also, her relationships with other guild members would likely expand. She might form closer bonds with some of the more reserved members of Fairy Tail, bringing them out of their shells.
The guild would likely be ecstatic. Gray would probably make some snarky comment about Natsu finally growing up, but deep down he'd be happy for his friend. Erza would be all for it and might start planning the wedding immediately, giving orders to everyone in the guild to help out.
One way it could end is with a big showdown. The Fairy Tail guild members find the kidnappers' lair, and there's an epic battle. Natsu defeats the main kidnapper with his powerful fire magic, and Lucy is freed. Then they all return to the guild, where there's a big celebration.
Drunk Lucy could also be very argumentative. She might start debates with the more serious guild members like Erza about the silliest things, like whether or not it's proper to eat cake with a fork or hands. This would lead to some comical exchanges as the other members watch in amusement.
If Lucy never joined Fairy Tail, the friendships and relationships among the characters would form in a very different way. Also, many of the story arcs might not unfold as they do in the original plot.
Naruto would probably be very enthusiastic and friendly towards Lucy right away. He might be curious about her celestial spirit keys and ask a lot of questions. Lucy, on the other hand, might be a bit more cautious at first but would be drawn to Naruto's positive energy.
One interesting 'Fairy Tail End x Lucy' fanfiction could be the one where End and Lucy team up to fight a new and powerful dark magic user. In this fanfic, End's demon powers combined with Lucy's celestial magic create a unique and dynamic duo.
It would probably bring a new kind of warmth to the guild. Everyone in Fairy Tail loves family - like relationships, and Lucy and Mira being sisters would be a really cute addition. The other guild members would likely be very protective of their new 'sisterly' bond.", "Answer2":: "This new relationship could also change how missions are assigned. Maybe the guild master would send them on more sister - duo missions. And when they are on these missions, they could use their combined skills to gain more fame for the guild. For example, Mira could use her transformation magic to distract enemies while Lucy summons her spirits for the attack. This would make the guild seem even more united and strong.