What could be the plot of a fanfic where Alucard is Sera's master?

Sure. In fanfiction, the idea of Alucard as Sera's master has the potential for a great deal of creativity. It could mean that Alucard has a responsibility for Sera's growth and protection. This relationship might be set in a particular fictional world with its own rules and cultures, which would further shape the story around them.

The plot could be that Alucard is on a mission to take over a certain territory and Edward stands in his way as the protector of that place. So they engage in a series of battles.

One possible plot could be Seras and Alucard adjusting to a new world order after the war. They might travel around, encountering remnants of the old conflicts and helping to rebuild society in their own dark and unique ways.

If such a fanfic were to exist, perhaps the plot could involve an antagonist using some form of mind - control or brainwash on Rachel Alucard. The 'lemon' aspect might be used to add an element of shock or a different emotional tone. Maybe it could be that the brainwashed Rachel is made to do things she wouldn't normally do, and the story could revolve around her struggle to break free from the brainwashing while dealing with the consequences of the 'lemon' - related actions.

The plot could involve Naruto having Alucard's powers and abilities, like his vampiric strength and regeneration. Maybe he uses these new powers to protect Konoha from a new kind of threat that normal ninja skills can't handle.

In this fanfiction, perhaps Naruto is the reincarnation of Alucard due to some ancient prophecy. His journey would then be about discovering his connection to Alucard. He could start having strange dreams about Alucard's past life and battles. As he uncovers more, he realizes he has to use Alucard's powers to save the ninja world from a new, powerful threat that only his combined Naruto and Alucard abilities can defeat.

The 'Naruto neglected Alucard' fanfiction could have a plot where Alucard is brought into the Naruto world by some mysterious force. However, the shinobi community is so focused on their own affairs like ninja wars, clan politics, and training that they simply overlook him. Alucard, feeling slighted, decides to use his vampiric powers and centuries - old knowledge to carve out his own place. He might first target the outcasts or those on the fringes of society, and as his influence grows, he starts to draw the attention of the more powerful Naruto characters, leading to a complex web of relationships and power struggles.

Well, it could be about Naruto having some of Alucard's powers. Maybe he has enhanced strength and speed like Alucard. And he could use these powers to protect Konoha in a new and unique way.

Well, it could be about Alucard and Seras teaming up to fight a powerful new vampire threat. Maybe they discover a group of vampires that are trying to take over the city and they use their combined powers to stop them.

One possible plot could be that Naruto, during one of his travels, stumbles upon the world where Alucard exists. Alucard, being intrigued by Naruto's unique chakra, decides to test him. Naruto, on the other hand, sees Alucard as a powerful and somewhat mysterious figure. They could end up teaming up against a common enemy that threatens both their worlds, combining Naruto's ninja skills and Alucard's vampiric powers.