Yes, it was inspired by Twilight fanfiction. It shares some of the same elements of the passionate and somewhat forbidden love that was present in Twilight.
Yes, it was based on Twilight fanfiction. However, it could also have elements inspired by other works. For example, the idea of a complex and somewhat tortured hero can be found in many literary works. Gabriel Inferno might have incorporated some of those general literary ideas while still having its foundation in Twilight fanfiction. The way the story unfolds in terms of the emotional journey of the characters could also have been influenced by other romantic novels.
Yes, there are quite a few. You can start by looking on Archive of Our Own (AO3). There are many talented writers in the Good Omens fandom who might have explored this scenario in their works. Just search for the relevant tags and you'll likely find some interesting stories.
In some fanfictions, it could be a strategic move. Gabriel might think that by getting closer to Aziraphale in such an intimate way, he can manipulate him into following a certain plan or decision that aligns with Heaven's interests. Or perhaps he's trying to assert his dominance over Aziraphale in the complex hierarchy of angels. Another reason could be that he's under some sort of spell or influence that makes him act out of character.
The First Master to the Eighth Master of Hell were the First Master and Second Master, Judge Cui Jue, Judge Zhong Kui, Bull Head, Horse Face, Golden Shackle and Silver Lock, Black Impermanence, and White Impermanence.
Breaking Hell was a basic ritual in Taoism. According to the concept of Taoism, hell was the place where the netherworld sank and stayed. Those who committed sins during their lifetime would definitely fall into hell after they died. The purpose of breaking the hell was to use the divine light and mana to break the darkness of the other side through the ritual, so that the dead would suddenly wake up and let go of their obsession, thus transcending the immortal world and no longer suffering from hell. The specific hell-breaking ceremony was held on the night of the funeral. The Taoist priest placed the ingots and the names of the deceased on the ground in the middle of the mourning hall, then lit the ingots. The Taoist priest led the deceased's relatives to chant around the fire, and then the Taoist priest used the long iron in his hand to smash the tiles around the fire. The purpose of this ritual was to help the dead release their sins and escape from the sea of suffering through prayers and rituals.
The list of names in the underworld included the Emperor of Feng Du, the Emperor of Dong Yue, the Ksitigarbha Bodhisattva, the Ghost Emperors of the Five Regions, the Yama of the Ten Halls, the Lord of the Sixth Case, the Black and White Impermanence, and so on.
Sure is! Inferno is a fictional novel that has captured the attention of many with its engaging plot and vivid characters. It's available in various editions and languages.