I'm not entirely sure what 'bahan sex hindi story' specifically refers to as the term is rather unclear. It could potentially be a Hindi story related to some aspect of relationships or human nature, but without more context it's difficult to say exactly.
I'm not entirely sure as 'bahan' might be a misspelling or a very specific term in a certain context. 'Hindi' means 'not' in Malay or Indonesian, or refers to the language in India. But without more context, it's hard to say exactly what this phrase means.
Growth and learning are also important themes. Through the experiences they have together in the story, both the brother and the sister grow as individuals. They learn about themselves, their relationship, and about life in general. For example, they might learn the value of forgiveness when they face a situation where they have to forgive someone who has wronged them during their adventure or in their daily lives.
Well, I haven't come across any definite confirmation that Meri Guriya is based on real events. It could be inspired by various elements or completely fictional.