A great place to find such fanfiction could be Archive of Our Own (AO3). They have a large collection of fan works. Look for tags like 'Jasper', 'OC' and 'possessive' to narrow down your search. It might take some time to sift through but you're likely to find some interesting stories.
A lot of these fanfictions explore the idea of the OC being special in some way. Jasper's possessiveness then stems from his recognition of that specialness. It could be something like the OC having a unique power or personality trait that attracts Jasper. And there's also the theme of jealousy. If other characters get too close to the OC, Jasper's possessiveness kicks in and he might show signs of jealousy.
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 common theme is protection. Jasper, being possessive, is often depicted as extremely protective of his OC mate. Another theme could be the struggle with his vampire nature. His possessiveness might be intensified by his vampire instincts, like territoriality.
One aspect of 'bella and jasper possessive fanfiction' could be the power dynamics. If one is more possessive, it might imply a certain power imbalance in the relationship, at least in the emotional sense. For instance, if Bella is overly possessive of Jasper, it could limit his freedom in some ways. However, it can also be seen as a sign of their deep connection, where they don't want to lose each other.
A really popular one is 'Jasper and the Unlikely Ally'. The OC in this story is quite different from the norm. She has her own set of powers and beliefs which collide and then meld with Jasper's. It makes for a very exciting read as their relationship evolves throughout the story.
One popular jasper oc lemon fanfiction is 'Jasper's Unlikely Bond'. It has an interesting plot where the original character (oc) and Jasper develop a unique relationship. The writing is quite engaging, especially in the way it describes their interactions.
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.
Some fanfiction in this genre really stands out. For example, 'Jacob's Jealousy and Possessiveness'. This one explores how Jacob's possessive side comes out when there are other characters showing interest in the OC. It's filled with emotional moments and great character development. Also, 'Possessed by Jacob' is a unique take on the concept, where the OC is initially a bit intimidated by Jacob's possessive nature but then comes to understand it as a form of deep affection as the story progresses.
Protection is also a theme. Their possessiveness could be a form of protecting what they have. Jasper, with his past, might see Bella as something precious to protect. And Bella might be possessive in a way that she wants to protect Jasper from his own dark side or from other threats.
Well, in such a fanfiction, it usually involves Jasper being overly protective and possessive of Bella. Maybe he doesn't like other characters getting too close to her. It could be about their relationship developing in a very intense way, with Jasper constantly showing his strong feelings for Bella.