Since we don't have much information from just this title, it might be a fictional story where the niece is involved in something that is considered unacceptable in the story's setting. Maybe it has to do with family secrets or improper behavior within the family unit.
Well, in this fanfiction, perhaps the uncle has heard so much about the baby niece from the family. When they meet, he could be a bit nervous at first, but then as he holds her, he feels a deep connection and starts telling her stories about the family, even though she can't really understand yet.
One possibility could be that the niece discovers a family secret that she's not supposed to know, like a past scandal involving her parents or other relatives.
Hentai with real story could potentially have more depth in terms of character development compared to regular hentai. While regular hentai is usually more about fulfilling sexual fantasies, hentai with real story may try to use real - life situations as a backdrop to the story. But still, hentai is a form of adult - oriented media, and it's not suitable for public or general viewing. There are better forms of media like regular anime or movies to get engaging stories and character development.
Well, it would probably have complex characters. Just like in normal good stories, there would be characters with different personalities, motives, and backstories. For example, a character might be on a quest for revenge because of something that happened in their past.
Well, often there could be a theme of the haunted place. The setting of the story, which is usually a spooky place like an old mansion or a deserted cemetery, becomes an important part of the hentai. The three ghost stories might each have a different take on how the haunted location affects the characters' actions and relationships. Also, the idea of the ghosts being able to possess or influence the humans in a sexual context could be a theme.
In these types of manga, a mother's love can be presented in unconventional and sometimes disturbing forms. It might involve elements that are far from typical expressions of maternal affection, often for shock value or to explore taboo themes.