I'm not entirely sure as I haven't read this specific fanfiction. But generally, in fanfiction, 'hinata' might be a character who is put in a situation where a certain physical or emotional experience (in this case, the idea of orgasm denial which is a rather mature and inappropriate concept in a general sense) is being explored in the context of the fictional world created by the fanfic writer.
One common theme is Hinata's unrequited love. Since she has strong feelings for Naruto but often doubts if he feels the same, seeing him with others can easily make her jealous. For example, in many fics, she might see Naruto being close to Sakura and her jealousy stems from her fear of losing him to Sakura.
Perhaps Hinata is kidnapped because she has some unique power or knowledge that the kidnappers want. In the fanfiction, the story could focus on how she uses her wits and hidden strength to try to escape while her comrades search for her. For example, she might be able to communicate with a small animal in the cell she's held in and use it to send messages.
It could be a rogue ninja who has a grudge against Hinata's clan. Maybe this ninja was once rejected by the clan and now wants revenge by taking Hinata.
Hinata might react with anger. She's a strong - willed character deep down. So she could confront the person who cheated on her head - on. She might yell and express her disappointment and hurt. This would show her growth from a shy girl to someone who stands up for herself.
One common theme could be self - discovery. Hinata might be getting advice on how to better understand her own strengths and weaknesses. Another theme could be friendship. The advice might be centered around how to build stronger relationships with her friends. Also, there could be a theme of growth, like learning new skills or becoming more confident in her abilities.