It helps in world - building. Consider a BL novel where the game world is a parallel universe. The game loading process can introduce different rules, landscapes, and characters specific to that world. This enriches the overall plot as the two male leads navigate through this unique game - loaded world and their relationship evolves accordingly. It can also be a way to introduce time - jumps or changes in the story's pace. If a game has to load a large amount of data, it could symbolize a significant shift in the story, like a change in the characters' goals or the direction of their relationship in the BL novel.
Game loading can create suspense. For example, when a character is about to enter a new level or area in the game within the novel, the loading time can be used to build up anticipation. The reader wonders what will happen next in this new virtual space, especially if it's a key location for the BL relationship to develop.