One way is through pacing. They slow down the story when Naruto is at his weakest, making every moment count. They might also use flashbacks to show what Naruto has to live for, like his friends and his dreams for the village. This makes the readers more invested in his survival. And they introduce unexpected twists, like a false hope of recovery that turns out to be a trap or a new threat emerging just when it seems Naruto might be saved.
They create tension by isolating Naruto. If he's alone and nearly dying, it makes the situation more dire. Writers also describe the environment in detail. If he's in a dark, cold place while on the verge of death, it adds to the mood. And they show the consequences of his possible death, not just for him but for the whole Naruto universe. For instance, how his death would affect the balance of power between the villages or the future of his friends.
Writers create tension by making the danger seem real. They describe Naruto's injuries in detail, like his labored breathing, his weakening chakra flow. For example, if he's been stabbed, they might write about the pain shooting through his body. This makes the readers worry about his survival.
Another way is through the description of Taehyung's own state. If he's in pain but trying to be strong, or if he's confused and hurt by the situation, it makes the readers feel for him. The writers might also introduce some obstacles in his recovery process, like a lack of proper medical facilities or some internal conflicts within the group that delay his getting better. This all serves to create and maintain tension throughout the fanfiction.
One way is through the reactions of the other characters. If the village leaders start to question whether Naruto can still be a useful ninja, it creates tension. And if his friends are divided on how to help him, that also adds to it. Another method is by introducing new threats that specifically target Naruto because of his weakened state due to his breathing problem. Maybe there's a group that wants to take advantage of his vulnerability.
Writers create tension in erotic romance stories through the characters' internal struggles. For instance, if one character has moral or ethical beliefs that conflict with their growing sexual attraction to another. Also, external factors like family or social disapproval can add to the tension.
Writers create tension by showing Sonic's pain and struggle. For instance, if he's trying to run but the injury stops him, it builds tension. Also, when his friends are worried about him, like Tails panicking as he tries to figure out what's wrong with Sonic, that adds to the tension.
One way is through time pressure. The writer could set a deadline for Lupin to rescue the kidnapped person, like if he doesn't do it within 24 hours, something terrible will happen to the victim. Another is by introducing obstacles in Lupin's path. For example, the kidnapper has set up numerous traps and guards around the place where the victim is held. And the writer can also build tension by revealing bits of the kidnapper's plan gradually, making it seem more and more menacing.
Another way is by creating a sense of helplessness. The writers might show Percy's friends being unable to reach him in time or not having the power to stop the danger. This adds to the tension. And they use foreshadowing. Maybe there are small hints earlier in the fanfiction that something bad is going to happen to Percy. So when the near - death scene arrives, it feels even more intense. For instance, there could be a strange omen or a prophetic dream that was mentioned before.
By making the consequences of their actions towards each other more severe. Say Naruto's actions lead to Ino being seriously injured and she loses her ability to use some of her ninja skills for a while. The fear of whether she will ever regain those skills and the guilt Naruto feels can create a lot of tension in the story. Also, if there are external factors like other ninja clans getting involved in their conflict because of what happened between Naruto and Ino, that can add more layers of tension.
Another way is through the setting and external factors. In a Chinese fanfiction, the social or family background might be a big factor in the forced love. If a family forces two characters together, the pressure from the family and the characters' attempts to deal with it can build up a lot of tension. Also, secrets within the forced relationship can add to the suspense and tension.
Another way is by creating a sense of danger. Since the animatronics can be menacing in the Fnaf universe, writers will put the reader character in situations where they are at risk of being harmed by the animatronics. This keeps the readers on the edge of their seats. Also, the mystery surrounding the animatronics' backstories adds to the tension. We don't know exactly what makes them act the way they do, and as the story unfolds and we learn more little by little, the tension builds.