Yes, there might be such fanfictions out there. Fanfiction is a creative space where all kinds of wild and unique ideas can be explored. Writers often come up with unusual relationships between characters just for the sake of exploring different storylines and character dynamics.
It could be really interesting. Maybe Naruto had some kind of secret past or mission that led to Sasuke's birth. It might show a different side of Naruto, one that is more fatherly and responsible, while Sasuke could struggle with this newfound knowledge and his feelings towards Naruto.
Since we don't have more details about 'Becky's dad adult stories', we can only guess about Becky's dad. He might be a father figure who experiences different events and has relationships with other characters in the stories. Maybe he is a kind father, or he could be facing some challenges that are central to the plot of the stories.
The dad of Peacemaker in the comics is Auggie Smith. Auggie's presence and actions have played a crucial role in shaping Peacemaker's journey and personality.