This novel might be the Lan Brothers. It was about the female lead Yaoyao and the male lead Lan Yunfeng, who were not related by blood. Yaoyao fell in love with Lan Yunfeng first, but Lan Yunfeng was not interested in her. The background of the story might be a fictional ancient Chinese world where the social class was more complicated and the relationship between men and women was more chaotic.
I don't know of a novel that fits your description perfectly. This type of novel is often called love horror or love restriction. There is a special emotional connection between the male and female protagonists, but they don't allow the female protagonist to date or be in love with others. If the female protagonist breaks this rule, she will face punishment or be trapped in a strange world. Although this kind of novel may be rare, there are some such novels. You can search for the relevant novel title or keywords to find inspiration.
It was the book, How Can I Not Be Tempted? Ning Suyi and Jing Chi had been friends for generations and were not biological siblings. However, Ning Suyi always treated herself as an elder sister and kept calling her younger brother. On the other hand, Jing Chi missed Ning Suyi and wanted to be her boyfriend. They got together later on, but Ning Suyi always felt guilty and did not like to be called sister. On the other hand, Jing Chi liked this title and would always revert to his old ways. Big Sister."
πI recommend you a novel about the love between a younger brother and a younger sister. Its name is "The younger brother can act coquettishly, and the older sister's soul is floating." It tells the story of a cold, beautiful, and intellectual older sister and a paranoid, possessive younger brother. They were not related by blood. Their parents had remarried. The older sister was a month older than the younger brother. I hope you like this fairy's recommendation. Muah ~π
πI highly recommend " My Beautiful Sister's Teacher " to you! This light novel was about a male protagonist sending his sister to school, but he met his ex-girlfriend, who turned out to be his sister's class teacher! The relationship between the siblings here was not ordinary! I hope you will like this novel.π
The book,"My Heart Begins When I Meet Him," matched the information given. The general plot of the novel was that the female protagonist became the daughter of a wealthy family after her rebirth, while her brother was the head of the family. They were not biological siblings. The sister's mother was the brother's stepmother. The older brother doted on his younger sister very much, displaying a typical sibling love experience. I hope you like this fairy's recommendation. Muah ~π
Where was the novel about 'Candy Is Not Sweet, Like Older Brother'? In that case, I recommend "Bring a God Home" to you. The female protagonist in the novel, Yi Qinghan, is not only a novelist, but also a very cute girl. She likes the industry god, Tianshan Muyun, but Tianshan Muyun is very cautious about relationships and doesn't want to easily dig out her heart for anyone. However, as time passed and fate arranged, their relationship became deeper and deeper. I hope you like my recommendation, Mwah ~π
According to the plot information provided, I recommend Lin Yan and Qiu Yu, a romantic and youthful campus novel. The plot of the novel described the childhood relationship between the sister and the younger brother. The sister was a school beauty with good family conditions, good grades, and good looks. The younger brother liked the sister, but the sister did not like him at first. This novel matched the plot information provided. I hope you will like this novel.π
I recommend "However, My Imperial Brother Dotes On Me" to you. This novel is about a noble and unparalleled princess who was destined to become the empress, but she fell in love with her affectionate and domineering imperial brother. The male and female leads are not related by blood. The female lead is intelligent and the male lead is affectionate and domineering. I look forward to your liking! I hope you will like my recommendation. Muah ~
This was a novel about siblings who depended on each other for survival. The gentle older sister had always taken care of the younger brother, and the younger brother had fallen in love with the older sister. They had protected the older sister in various ways, and they had even transmigrated together. It might involve crossing into different dynasties, with all kinds of adventures and challenges, as well as the interweaving of love and kinship.
" Sister Princess Hug Me " was an anime that told the story of a young man and his cousin. Although they were relatives, the cousin fell in love with the male lead and the male lead also had a good impression of her. This was a relatively relaxed and interesting anime with an attractive storyline and vivid characters.