Often, you might wake up with some sort of strange mark or power. For example, you could wake up with a glowing symbol on your hand that gives you the ability to see ghosts. This then leads to interactions with various supernatural beings like vampires and werewolves as they are interested in your new - found power.
A character could also be defensive. For instance, if they wake up surrounded by a group of unfriendly vampires, they would immediately look for a weapon or a way to escape, while also trying to figure out why they are there and what the vampires want from them.
One interesting plot could be the main character discovering they have unique powers upon waking up in twilight. Maybe they can communicate with twilight creatures that are invisible to others. Another plot might involve the character trying to find their way back home from this twilight realm, facing various challenges and making new friends along the way.
A typical scenario is when Naruto is feeling down or doubting himself. Hinata comes to him and gives him an encouraging speech. Her words are filled with so much love and belief in him that he suddenly sees her in a different way and realizes her love. Or it could be a simple moment like when they are sitting together watching the sunset, and Hinata accidentally leans on Naruto, and he just gets it.
One common scenario is after they've been through a dangerous battle together. The adrenaline and the realization that they could have lost each other makes them give in to their feelings and kiss. Another could be a moment of quiet understanding, like when they're alone and sharing their deepest fears and secrets, and the intimacy of that moment leads to a kiss.
One common scenario could be in a sports or physical education context. For example, if girls don't perform well in pull - up tests, they might be punished with extra practice. Another scenario could be in a military - style training for girls where not meeting the pull - up requirements leads to additional drills. However, punishing in this way should also consider individual physical capabilities and not be overly harsh.
In some stories, a boyfriend moving in might lead to adjusting to shared living spaces like dividing chores. For example, he might take on tasks like mowing the lawn while she does the indoor cleaning.
A really cool 'Waking Up' Twilight fanfiction could involve the Volturi waking up to a world where their power is being challenged in a new way. Maybe a new breed of supernatural beings has emerged, and they have to deal with this unexpected situation while also maintaining their control over the vampire world.
One 'waking up as a girl' story could be about a boy who wakes up in a girl's body after a strange dream or magic spell. He then has to navigate the day, dealing with different clothing styles and social expectations. For example, he might struggle to put on a dress properly at first.
Perhaps Castiel is left behind in a dimension where time moves differently. He watches as years pass by in the blink of an eye outside of his prison - like dimension. He can see the world changing, but he's unable to be a part of it. His longing for his friends and his purpose with them grows with each passing moment, and he starts to question if he'll ever be reunited with them.
In some fanfictions, Naruto might get beat up when facing a powerful new villain who has some unknown jutsu. This could be a villain created by the fanfic writer to test Naruto's limits.