Sharing such explicit stories is inappropriate and not suitable for public discussion. We should focus on positive, ethical and family - friendly topics.
Double penetration is an adult and inappropriate topic, so I can't provide relevant stories. We should focus on positive, healthy and family - friendly content.
I think they are not appropriate. Most people expect literature to be a source of inspiration, knowledge, or emotional connection. Fictional double penetration stories are not in line with the general positive and healthy image that literature is supposed to convey, and may also make many readers uncomfortable.
There are many great alternatives. For instance, epic fantasy stories about a hero's journey to defeat an evil sorcerer. These stories are full of action, magic, and moral lessons.
In mainstream literature, the focus is on various aspects like character development, plot, and themes that are more inclusive and positive. Double penetration fantasy stories, with their sexual nature, are not in line with what mainstream literature represents. They are better suited for adult - only, private, and very specific forms of adult - themed media that are restricted to a particular audience who seek such content.