In a story, there could be a situation where a magical curse is spreading. Beast Boy, seeing Raven in the path of the curse, uses his own body to block it. As a result, he is infected by the curse which starts to harm him physically and mentally. Raven then embarks on a journey to find a cure, all the while taking care of Beast Boy and their relationship deepens through this difficult time.
In many Beast Boy and Raven fanfictions, Beast Boy's act of protecting Raven is quite common. When he gets hurt in the process, it often adds a layer of drama. Maybe he takes a blow meant for Raven during a battle with a powerful villain. This could lead to Raven realizing her deeper feelings for him as she tends to his wounds.
Well, perhaps they have an argument first. Raven is usually so reserved and Beast Boy is more carefree. They could be arguing about how to handle a certain situation with the Titans. But then, as emotions run high, instead of more yelling, they end up kissing. It could be a turning point in their relationship where they start to see each other in a new light and have to deal with the new feelings that come with that kiss.
One possible plotline could be that Timmy and Trixie are in a magical forest when a group of dark fairies attacks. Timmy uses his fairy - godparent powers to shield Trixie from their harmful spells, getting hurt in the process. Trixie then has to find a way to help him, like searching for a special healing flower.
In a plotline, the enemy might be after Vivi for some political reason. Luffy steps in without hesitation. He gets hurt but his determination to protect Vivi doesn't waver. This could lead to the Straw Hat crew coming together in a new way to face the threat. For example, Nami could use her navigation skills to find a safe haven where Luffy can recover while the others hold off the enemy.
Maybe they are in a forest filled with dangerous magical creatures. A giant snake - like creature lunges at Annabeth. Percy quickly moves in front of her and the creature bites his leg. In another situation, they are in a magical maze. There are walls closing in on them and spikes starting to protrude from the sides. Percy pushes Annabeth out of the way of a spike that was about to impale her, but he gets scratched all over his body. And they could be in a fight against a powerful sorcerer. The sorcerer casts a spell of dark energy towards Annabeth, and Percy uses his own power to try and block it. However, some of the dark energy seeps through and causes internal damage to Percy.
She would likely feel guilt. Since Beast Boy got hurt protecting her, she would blame herself to some extent for putting him in that dangerous situation.
One idea could be that they are hurt during a battle with a powerful new villain. Maybe they underestimate the enemy's strength and end up with physical injuries. This could lead to them having to rely on each other more for support and also force them to confront their own weaknesses.
One possible fanfiction plot could be during a village invasion. Naruto, with his unwavering sense of justice and his growing feelings for Hinata, shields her from an enemy's attack. He might get seriously injured, which then spurs Hinata to tap into her own hidden power to defend him in return. This kind of story can explore their bond deeper and show how they support each other in tough times.
There could be a fanfiction where Naruto and Ino are exploring an ancient ruin. Unbeknownst to them, there are traps everywhere. When a huge boulder starts rolling towards Ino, Naruto pushes her out of the way. He gets crushed under the boulder's edge. Ino is desperate to save him. She manages to find some herbs in the ruin that have healing properties and uses her medical knowledge to treat Naruto's injuries. Meanwhile, Naruto's willpower also helps him in his recovery.
One possible scenario could be that Shinra and Iris are in a battle against some powerful demons. Shinra tries his best to shield Iris from the demons' attacks. As he does so, he gets seriously injured but still manages to hold off the demons long enough for backup to arrive. Iris is deeply moved by his selfless act and vows to become stronger to protect him in the future.