A novel about a brother-sister relationship (not related by blood)

An example of a novel about a brother-sister relationship is as follows: " Silent Xiao Sheng " was about the love story between Mosheng and He Yichen. Although He Yichen was three years older than Mosheng, their relationship was not related by blood. At first, Mosheng only saw him as a brother, but as time passed, she found that she gradually fell in love with him. Xiao Nai and Bei Weiwei were also in a brother-sister relationship in the game. Although Bei Weiwei was one year older than Xiao Nai, their relationship gradually developed in the game. They met in the game, fell in love in the game, and got together in real life. Fang Yu and Lu Li were also in a brother-sister relationship. Although Fang Yu was two years older than Lu Li, they were not related by blood. At first, Fang Yu only saw Lu Li as her younger brother, but as time passed, she found that she gradually fell in love with him. These novels all told the story of a brother-sister relationship and had their own unique plot and ending. It wasn't rare for a brother and sister to fall in love. As long as the two people were truly in love, age didn't matter.