An accidental encounter on Earth could also work. Jane could be at a scientific conference, and Thor, who is on a mission to understand Midgard better, just happens to be there. They lock eyes across the room, and that instant connection is still there. They start talking, and the old feelings start to come back as they catch up on each other's lives.
One way it could happen is through a shared danger. Maybe a new powerful enemy emerges that threatens Asgard and Earth. Thor and Jane are forced to work together again. As they face this threat side by side, they start to remember all the reasons they fell in love in the first place. The adrenaline of battle and the shared goal of protecting their worlds reignite their passion.
One common plot device is Sakura setting up 'accidental' meetings. For example, she might make it seem like Naruto and Hinata just happen to be at the same place at the same time, like at a local festival. This gives them an opportunity to interact without it feeling too forced.
One common plot device is using the Time Stone. In Thor - related time travel fix - it fanfiction, the Time Stone can be used to reverse certain events that led to bad outcomes for Thor, like the destruction of Asgard. Another is the use of alternate timelines. Writers might create a timeline where Thor makes different choices, such as not going for the power - up in Ragnarok that left Asgard vulnerable, and then figure out a way to merge this better timeline with the main one. And sometimes, they use a character's special time - traveling abilities, like Loki's tricks with time, to fix things that went wrong for Thor.
Often, the 'fish out of water' feeling is a plot device. Caroline, coming from a different time, would be out of place in the past. This can lead to humorous situations as well as moments of self - discovery. Another one is the time - travel mechanism itself. It could be a magical object like a time - traveling amulet that has its own rules and limitations. She has to figure out how to use it properly to get back to her own time. And there might be a 'guardian of time' type of character who tries to stop Caroline from changing the past, creating a conflict between her intentions and the natural order of time.
One common plot device is the power - transfer. Another character with similar powers might transfer a portion of their power to Ichigo, jump - starting the process of him getting his powers back. It's a simple yet effective way to show his power restoration.
One common plot device is time travel itself. For example, the protagonist might accidentally travel back to the era when the Phantom first haunted the opera house. Another is the alteration of historical events. The character could change something in the past that has a big impact on the present in the Phantom of the Opera world. Also, the discovery of lost secrets from that time period often plays a role. Maybe the character finds a hidden diary of the Phantom that reveals his true motives and past, which then drives the rest of the fanfiction story.
Another plot device could be the revelation of a long - lost prophecy or a secret document. This prophecy or document might have the key to proving Sirius's innocence. It could be something that was deliberately hidden by the villains who framed him. Once it is discovered, it provides all the necessary evidence to clear his name, such as a prediction that Sirius would be wrongly accused and the real perpetrator would be revealed in a certain way.
One possible plot could be that after a long time apart, they accidentally meet at a place that holds significance for them, like the old Total Drama Island. Their initial encounter might be filled with awkwardness and old grudges resurfacing. But as they start talking, they realize they still have feelings for each other. Maybe Duncan has changed for the better during their time apart, and Courtney sees this new side of him that makes her fall in love all over again.
One possible plot could be that after a long time apart, Scott and Allison accidentally meet at a place that holds a lot of memories for them, like the high school where they first met. This encounter stirs up old feelings, and they start to talk about the past. Slowly, they realize that they still love each other deeply and begin to rekindle their relationship.
One possible plot could be that they meet by chance after a long time apart. Maybe at a Downworlder event where Magnus is using his magic to create some amazing display. Alec, who is there on some Shadowhunter business, can't take his eyes off Magnus. They exchange a few words, and the old feelings start to resurface.