Since 'serre visual novel' is not a very common term that I'm familiar with in the context of popular, well - established visual novels, it's difficult to point out specific popular titles. It could be that it's a new or emerging concept in the visual novel world. There may be some small - scale or up - and - coming works that are starting to gain traction within the more dedicated visual novel fanbase, but again, without further research, I can't name any particular titles.
A 'serre visual novel' could be a very unique form of interactive storytelling. It might involve various elements such as interesting characters, a complex plot, and beautiful visuals. It could be set in different worlds, like a fantasy realm or a modern - day city. The stories in visual novels often revolve around relationships, personal growth, or solving mysteries.
There isn't a widely known and clearly defined 'love story' in the traditional sense between Kukulkan and Quetzalcoatl in a single unified narrative. However, both are important deities in Mesoamerican cultures. Kukulkan was a Mayan deity often associated with snakes and the sky. Quetzalcoatl was a significant Aztec deity, often depicted as a feathered serpent. They share similarities in their serpent - like forms and their connection to important aspects of the cosmos, but there is no common, well - established love story between them.
I'm not sure specifically as there could be many different takes on this. It might be about Percy being in a dangerous situation and Quetzalcoatl, a powerful figure from mythology, coming to his rescue in the context of a fan - created fictional story.
In a fanfiction, Harry as a Quetzalcoatl Animagus could play a crucial role in a battle against Voldemort. His Animagus form could be resistant to certain dark spells, and he could use the large size and strength of the Quetzalcoatl to his advantage. Maybe he could also communicate with magical creatures from the Americas that are drawn to his new form, and they could help in the fight against the Death Eaters.
It's likely that the main characters from the original 'Highschool DxD' series would still play important roles. Maybe Issei Hyodo would be there, adapting to the new quetzalcoatl - influenced environment.
There's no way to know for sure who the author is without more information. It could be anyone who is a fan of the relevant source material (maybe Percy Jackson series) and has an interest in Quetzalcoatl from mythology.
In some of these fanfictions, there could be a focus on the mythology of Quetzalcoatl integrated into the Highschool DxD universe. This could lead to exciting tales where the characters have to face off against threats related to this ancient mythology while also dealing with the typical high - school drama and the battles that are characteristic of the DxD world. There might be new magical abilities or artifacts inspired by Quetzalcoatl that change the course of the story.