One popular fanfiction could be 'Gaara's Obsession'. In this fic, Gaara's possessiveness over Naruto is shown through his actions to protect Naruto at all costs. It's full of emotional moments and action scenes.
There is 'The Gaara - Naruto Bond' which delves deep into how Gaara's possessive nature towards Naruto develops over time. It starts from their early encounters and shows how Gaara gradually becomes more and more possessive as he realizes Naruto's importance to him. The story also has great character development for both of them.
A lesser - known but really interesting fanfiction is 'Possessive Gaara: Naruto's Protector'. This one has a unique take on Gaara's possessiveness. It shows how Gaara's feelings are a mix of friendship, admiration and possessiveness. He will go to great lengths to keep Naruto safe and by his side, and the story has some really sweet and intense moments.
Chapter 646, "This person deserves a slap in the face!", is the clearest early answer because it turns Don's situation into a concrete plot event.
The best chapter pointer here is Chapter 11, "She Smiled, He Panicked". It opens with After a meeting, Shang Shaojing pinched the bridge of his nose, tired, and... and closes on Miss Qin, please accompany us to the police station to explain this....
Chapter 776, "Sister Li Keeps a Toy Boy?", is the clearest early answer because it turns Toy Boy's situation into a concrete plot event.
Chapter 796, "No Such Person?!", is the clearest early answer because it turns Lin Manru's situation into a concrete plot event. A useful checkpoint is the way the scene starts with The lively family reunion night came to an abrupt halt, and the...
The best chapter pointer here is Chapter 2, "What Kind of In-laws Are They?". It opens with On the top floor of the Financial Building, a gathering of dark clouds... and closes on Jiang, Lin Manru, turned pale and quickly explained, "It's not eloping, my....
Look to Chapter 16 for the clearest answer. It begins with Just as the words fell, Jiang Shixu swiftly cast his eyes downward., keeps building through His eyelashes were very long;
Chapter 778, "The Gift of Being a Director", is the clearest early answer because it turns Taifan's situation into a concrete plot event.
The best chapter pointer here is Chapter 26, "Sending My Big Brother to a Transformation Variety Show". It opens with Shen Lan was bent over processing a large stack of press briefs on her... and closes on If you think you can use our family connection to have me handle this....
Chapter 699, "I'm Going to Hold My Great-Grandson!", is the clearest early answer because it turns Miss Jiang's situation into a concrete plot event.