Often in these fanfictions, Sasuke gets jealous when Sakura is training with someone else who is really good at a particular skill. Let's say she's training with Rock Lee to improve her taijutsu. Sasuke might see how dedicated Lee is to helping Sakura and get jealous. He may think that he should be the one helping her. And then he might try to interrupt their training sessions or show off his own skills in front of them to prove that he's better, all because of his jealousy.
A common scenario is during battles. Sasuke, with his Sharingan and combat skills, will shield Sakura from enemy attacks. For instance, if they are facing a powerful enemy ninja, Sasuke would put himself in front of Sakura to take the brunt of the attack.
A great fanfiction idea is that Sasuke is jealous when Sakura is chosen to go on a mission with a group of other ninjas, and he's not included. He secretly follows them and ends up saving the group from a dangerous situation. Sakura realizes that Sasuke's jealousy was actually his way of showing he cares about her, and this event brings them closer together.
A common scenario is when Naruto is given a special mission or task that Sasuke feels he should have been chosen for. Sasuke's pride and his competitive nature with Naruto make him jealous. He might think that Naruto is being favored over him.
One common scenario could be when Hinata gets attention from other male characters. For example, if Kiba compliments Hinata on her skills during a mission. Naruto might feel a pang of jealousy, thinking that he should be the one to notice and praise her first. Another situation could be at a village event where Hinata is asked to dance with someone else. Naruto would watch with envy, secretly wishing it was him she was dancing with.
Well, sometimes in this kind of fanfiction, Sasuke insults Sakura when he's feeling pressured by his own dark path. He might see Sakura as a reminder of the normal life he can't have. For example, he could say 'Your naive dreams are nothing but a waste of time, Sakura.' It could also be that he's trying to protect his image among his enemies and thinks that by insulting Sakura, she'll be less of a target.
One common theme is Sasuke's struggle to admit his feelings. When he's jealous, it shows that he actually cares more about Sakura than he lets on. Another theme could be misunderstandings. He might misinterpret Sakura's interactions with others as something more than friendship.
A common scenario is when Naruto is praised by someone else, like another ninja in the village. Sasuke may get jealous because he wants to be the one Naruto looks up to or the one whose opinion matters most to Naruto. Another scenario could be when Naruto makes a new friend, and Sasuke sees them spending a lot of time together. He might feel left out and jealous.
One common scenario could be Naruto getting close to another female character. For example, he might be training with a new girl who has some special abilities. Sakura, seeing them together often and Naruto showing interest in the new girl's skills, would start to feel jealous. She might try to interfere in their training sessions or act cold towards Naruto.
In some fanfictions, Sakura has a spiritual journey. She might go on a pilgrimage or study under a wise sage. During this process, she gains inner peace and self - discovery, which allows her to look at her relationship with Sasuke in a new light and finally move on.
A common scenario is when Sakura tries to confess her feelings to Sasuke. He might reject her harshly, not just saying no but also making mean comments about her weakness or her being a nuisance. Another scenario could be during team missions. If Sakura makes a mistake, Sasuke might berate her in front of everyone, not considering her feelings at all. And sometimes, when Sakura tries to offer him help, like when he's injured, he might push her away rudely, as if her help is unwanted and beneath him.