It could be a story where they travel to a future time. They see a dystopian version of their world where their powers were misused. Ben's Omnitrix has been corrupted and is causing destruction, and Gwen's magic has been turned into a tool for oppression. They then have to figure out how to reverse this future by going back in time and changing the events that led to it. They might meet older versions of themselves who have become jaded and lost hope, and they have to convince themselves to fight for a better future.
Well, one possibility could be that Ben and younger Gwen travel to a time when their family had a big secret. They might discover something about their powers' origin. For example, they could find out that an ancestor was also a wielder of the Omnitrix - like powers, but in a different form. This could lead to a series of adventures where they have to protect this secret from villains who want to use it for evil.
The plot could involve them traveling to a time when their relationship was different. Maybe they were rivals instead of friends. They would then have to work through their differences while also dealing with the time - travel chaos around them. For instance, they might accidentally change an event that has a huge impact on their present lives, like preventing their grandpa from getting a certain weapon that helped them in the future. So they have to fix it while also mending their relationship.
A possible plot for this fanfic could be that Ben and younger Gwen time travel to an era where the Plumbers first started. They get to see how the organization was founded and meet the early members. Ben might learn some new tricks about using the Omnitrix from these predecessors. And younger Gwen could discover new magical abilities or knowledge that she can use when they return to their own time.
A Ben 10 fanfic about Ben and younger Gwen time traveling could be really exciting. It could involve Ben using his Omnitrix in different time periods, and Gwen having to deal with her younger self. Maybe they go back to stop an alien invasion that was actually a result of something they did in the past. There could be a lot of character development as they see how they've changed over time.
One possible plot could be that Older Ben, having experienced more of the Omnitrix's power and the perils of the universe, takes Younger Gwen under his wing to train her in her magical abilities. They might go on adventures together where Ben uses his alien forms and Gwen uses her magic to fight enemies. Along the way, they develop a deeper bond of friendship and mutual respect.
In a 'Ben 10 Ben X Young Gwen Time Travel Fanfic', the possibilities are endless. They could travel to the future first and see a dystopian version of their world where the bad guys have won. This spurs them to go back in time to prevent it from happening. Along the way, they might meet their future selves who give them clues or warnings. Their time - traveling could also cause some unforeseen consequences, like creating alternate timelines. For example, if they change one small event in the past, it could lead to a completely different Ben 10 universe in the future. So they have to be very careful with their actions during their time - traveling journey.
Ben might develop a greater sense of responsibility. In the time - travel journey, he could see the consequences of his actions more clearly. For example, if he uses the Omnitrix recklessly in the past, it could lead to a bad future. So he would learn to be more cautious and think about the long - term effects. Younger Gwen, on the other hand, might become more confident. She could learn new spells during the time - travel and use them to protect herself and Ben. This would boost her self - esteem.
Perhaps in the fanfic, a strange energy wave hits Bellwood which causes some sort of connection between Ben, Gwen and a group of girls (the harem). Ben is initially confused as to how to handle this new dynamic. Gwen tries to keep everyone in line and focused on protecting the city. As they explore the source of this energy wave, they come across an ancient artifact that seems to be the cause. They must figure out how to reverse its effects while also dealing with their new relationships. There could be some sweet moments between Ben and Gwen as they navigate this new situation with the harem, and some action - packed battles against the guardians of the artifact.
There could be a friendship - based dynamic where they are equals despite the age difference. They share their secrets, like Ben telling Gwen about some of his toughest alien battles and Gwen sharing her insecurities about her magic. They support each other through thick and thin, whether it's facing a powerful enemy or dealing with family drama at home.
Perhaps the 'lemon' is a key to unlocking different time portals. Ben and Gwen might discover this lemon - shaped key in an old attic or a mysterious cave. Every time they use it on a specific time - travel device, it takes them to a new and exciting era. They could end up in ancient Egypt and have to solve the mystery of a lemon - related curse that is affecting the pharaoh's tomb.
I'm not entirely sure what specific 'lemon' means in this context. If it's about a Ben and Gwen time - travel fanfic, it could be really exciting. Maybe it involves them traveling to different eras and having various adventures. They could go back to prehistoric times and encounter dinosaurs, or forward to a future with advanced technology and have to figure out how to get back home.
One idea for a Ben 10 Ben and Young Gwen time travel fanfiction could be that they travel back to the time when the Omnitrix was first created. They could witness the origin of the device and perhaps even meet the aliens who had a hand in its creation. This could lead to them learning secrets about the Omnitrix that they didn't know before, which could help them in their present - day battles.