There are likely fanfictions that put them in comical situations. Picture a story where Garth tries to cook for Lilly but everything goes hilariously wrong. Or perhaps a story where they accidentally switch identities for a day and have to deal with the chaos that ensues.
You can start by looking on fanfiction - specific websites like Archive of Our Own (AO3). It has a large collection of fan - created works, and you might be able to find some great Garth and Lilly fanfiction there.
Well, it might be special because of the unique relationship between Lilly and Garth within the 'alpha and omega' universe. Their story could have elements that are different from other characters in that setting.
Sorry, I'm not that familiar with specific 'alpha and omega lilly and garth fanfic'. You could try searching on fanfic websites like Archive of Our Own, where you might find a good selection.
I'm not sure if it's a common plot. Fanfiction has a vast range of themes and plots, and while cheating plots do exist, this specific one might not be extremely common. It could be something unique to a particular group of writers or a niche within the fanfiction community.
There could be several reasons. Maybe the writer is trying to create conflict. Cheating is a very effective way to introduce a lot of drama into a story. It can also be a way to explore different character personalities. For example, showing Garth's weakness or Kate's strength in dealing with such a situation. And perhaps the writer just has a unique take on these characters and wants to see how they would interact in this rather scandalous situation.
Again, without knowing the exact Lilly Manning story, it's hard to say its significance. But generally, a story can be significant if it teaches a moral lesson, like kindness or perseverance.