Musashibo Sugaki was a legendary character. He was a monk soldier at the end of the Heian era and one of the traditional representatives of the Japanese Bushido spirit. However, the search results did not mention any specific information about the Musashi Bou tattoo. Therefore, according to the information provided, I don't know the details of Musashi Bou's tattoo.
Typically, Bangladeshi natok love stories often have strong family elements. Family opinions and traditions play a significant role in the development of the love story. For example, in many stories, the couple has to face family opposition at first.
Since I don't know this particular story, it might be a story that is specific to a certain community or area. It could be about a relationship between a Kabuliwala (someone from Kabul perhaps) and a Bengali woman. But without more information, it's hard to tell the full story.
One popular Bangladeshi natok love story is 'Shokhi Tumi Kar'. It tells a beautiful and heart - touching love story between two young people. The story shows their journey of falling in love, facing difficulties together, and how their love overcomes all the odds.
I'm sorry, I'm not familiar with the specific 'kabuliwalar bengali bou' story. It might be a relatively unknown or regional story. You could try to find it in local libraries, ask local storytellers or search in specialized Bengali literature resources.
Unfortunately, without more context, it's difficult to provide the full story of 'bou kotha kou'. It could be a name of a story within a small community or an emerging piece of literature. If you could give some more details like where you heard it from or what kind of story it is (e.g. a love story, a mystery) it would be easier to answer.