Since I'm not familiar with this exact phrase, it could be a very specific regional or cultural term. Maybe it's related to a certain community's way of storytelling where 'biwiyon ki bahar' is a setting or a concept that is central to the plot. Without more information, it's hard to say exactly.
I'm not aware of any well - known stories specifically related to 'biwiyon ki bahar' as it's not a very common or widely known phrase in mainstream literature. However, it could be part of a local or regional body of stories that haven't gained international recognition.
One plot idea could be that Ben and Vestara team up to protect a group of younglings. They could be facing threats from pirates or other villains who want to kidnap the younglings for ransom or other malicious reasons. Ben and Vestara would use their combat skills and the Force to fend off the attackers and keep the younglings safe.
Ben Skywalker is a character from the Star Wars expanded universe. Vestara Khai is also from Star Wars. A non - sexual fanfic about them could focus on their adventures together, like exploring a new planet in the Star Wars galaxy. Maybe they are on a mission to find a lost Jedi relic and have to face various challenges along the way, such as battling Sith assassins or solving ancient puzzles.
I'm sorry, I haven't read this 'bagh o bahar urdu novel' specifically, so I can't provide reviews directly. But you can try to search for reviews on Urdu literature websites or forums.