Imagine Lucy is in the shower and she's singing a really off - key song. But little does she know that Gray and some other members of Fairy Tail are right outside the bathroom and can hear her. When she finally comes out, they start imitating her singing in a good - natured way, and Lucy is super embarrassed.
Another scenario could be that in a battle against a new, extremely powerful foe, Lucy is caught in a crossfire between two massive magical attacks. Despite her friends' attempts to protect her, she gets fatally injured and dies. This would have a huge impact on the other characters in the Fairy Tail guild, leading to themes of grief, revenge, and moving on.
Another scenario might be a situation where Natsu accidentally eats some magic - enhancing food that makes his emotions go wild. Lucy has to figure out how to calm him down and in the process, they realize deeper feelings for each other. For example, Natsu might start uncontrollably shooting fire everywhere, and Lucy uses her whip to lead him to a safe place where she can try to reverse the effect.
Lucy could also cry when she faces betrayal. In fanfiction, there might be a new character who befriends her and then turns out to have ulterior motives. This sense of being deceived and used would be a big blow to her, and she would likely break down in tears. And sometimes, it's just the overall atmosphere of the story. If the fanfiction is set in a really dark and hopeless time in the Fairy Tail world, with the guild in danger and no clear way out, Lucy might cry out of fear and worry for her friends and the future of the guild.
One interesting scenario could be when the baby's first magic manifestation occurs. It might happen during a guild party and startle everyone. Another scenario is that the baby gets lost in the guild's large building, and all the members, including Natsu and Lucy, go on a frantic search. A third scenario could be the baby developing a strange bond with an unexpected celestial spirit.
One popular scenario could be after a major battle where they both realize their deep feelings for each other. Natsu, being the impulsive and passionate character he is, might just grab Lucy and plant a kiss on her. Another could be in a moment of great celebration in the guild. With everyone around them having a great time, Natsu and Lucy get caught up in the moment and share a kiss. And sometimes, it might be in a more private, tender moment. Maybe Lucy is feeling down, and Natsu tries to comfort her in a more intimate way, leading to a kiss.
Maybe Lucy finds a long - lost spell book that belonged to a powerful Celestial Mage in the past. The spells in this book are the key to saving everyone. She spends time deciphering the ancient spells and finally manages to use one that can nullify the threat facing Fairy Tail. It could be a spell that can erase the existence of a powerful dark magic or something like that.
A fun plot could be that a magical creature gets into the shower with them. It's a small, mischievous thing that likes warm water. Natsu tries to catch it while Lucy tries to calm it down, leading to a lot of chaos and laughter.
Another scenario could be a misunderstanding within the guild. Maybe a new member misinterprets Lucy's actions as a threat and attacks her. In the heat of the moment, before the situation is clarified, Lucy gets beat up. This could lead to a story arc about resolving misunderstandings and building trust within the guild.
One possible scenario could be that she sacrifices herself to save her friends from a powerful dark magic. In the chaos of a huge battle, she might use all her magic power to create a shield that protects everyone else but drains her life force completely.
One popular scenario could be during a dangerous mission. Maybe they're trapped in a magical cave, thinking they might not make it out alive. In that moment of high emotion and closeness, they share a kiss. It's a way to express their unspoken feelings for each other that have been building up throughout their adventures together.