You can try looking on local Sinhala children's bookstores. They might have collections of such stories in cartoon form. Also, some libraries in Sinhala - speaking regions could be a good source.
As I don't know the novel, I can't say what's special about it. But generally, an author's last novel might sum up their life - long thoughts or writing styles in a unique way.
Sinhala culture is based on strong family values, religious beliefs, and a sense of community. Sinhala erotic novels, if they exist in large numbers, could potentially undermine these values. They might introduce ideas that are not in line with the traditional moral code of the Sinhala people, causing a shift in the perception of appropriate behavior.
Well, sometimes you can find it on certain online video sharing sites that have a collection of cartoons in different languages, including Urdu. But be careful to look for legal and reliable sources.
Sinhala novels often have strong cultural roots. They typically feature detailed descriptions of Sinhala traditions, festivals, and family values. For example, in many novels, you'll find references to religious ceremonies like Vesak.