I'm not sure specifically which 'bella and jane mate possessive fanfiction' to recommend. You could try searching on popular fanfiction websites like Archive of Our Own or FanFiction.net. They have a wide variety of fanfictions and you might find the ones related to this topic there.
One common theme could be the struggle for dominance between the mates. Since it's possessive, there might be a lot of tension regarding who has more control or claim over the other.
There's also 'Bella and Jasper: A Possessive Bond'. In this fanfiction, it focuses on the early stages of their relationship where Jasper's possessive instincts start to surface. It's interesting as it shows how Bella reacts to this new aspect of Jasper's personality and how they navigate through it together. It also has some great character development for both of them.
One popular possessive alpha mate fanfiction is 'The Alpha's Mate' by Jane Doe. It tells the story of a young woman who discovers she is the mate of a powerful alpha. The alpha is extremely possessive, which creates a lot of tension and drama in the story.
One popular Edward possessive mate fanfiction is 'His Obsession'. In this story, Edward's possessive nature towards his mate is explored in a very intense way. The author does a great job of showing how his possessiveness can be both alluring and a bit overbearing at times. It has a lot of emotional depth and some really sweet moments between the characters.
I'm not sure of a specific one off - hand. But you can start by looking on popular fanfiction websites like Archive of Our Own. Just search for 'Bella Swan sister Jane mate' and you'll likely find a variety of stories with different takes on the concept.
One popular 'possessive Carlisle OC mate fanfiction' is 'The Bond of Eternity'. It delves deep into the relationship between Carlisle and an original character as his mate. The story is filled with intense emotions and the possessive nature of Carlisle's love.
Finding good possessive Jasper OC mate fanfiction can be a bit of a hunt. You can start by looking at the tags on different fanfiction platforms. When you search for 'Jasper' in general, look for additional tags like 'possessive' and 'OC mate'. Some fanfictions might focus on how Jasper's possessive side comes out in his interactions with his mate, who is an original character. It could be about his protectiveness or his jealousy in the relationship. This can add an interesting dynamic to the story.
A popular one is 'The Possessive Love in Twilight'. This fanfiction explores the idea of a possessive mate through a series of events that test the relationship. It has great character development and the writing style is very immersive. The way the possessive elements are weaved into the story makes it a must - read for Twilight fanfiction lovers.
The theme of the supernatural bond between them is also common. Given that they are part of the Twilight world with vampires and mates, their possessive relationship is often tied to this supernatural element. Their bond is not just a normal romantic relationship but something deeper and more powerful, which is a major theme in these fanfictions. It can lead to some really interesting plotlines where their supernatural bond either strengthens or is tested due to Jasper's possessiveness.
There could be characters from the original stories that Bella and Jane come from. For Bella, characters like Edward or Jacob might still play a role, perhaps in the form of her past relationships that now create some sort of complication in her new relationship with Jane. From Jane's side, other Volturi members could be involved, like Aro or Caius, who might have opinions on Jane's new mate.