Itachi might be possessive because he is lonely deep down. Sakura's presence brings him some kind of comfort, and he is afraid of losing that. So, he holds on to her tightly in a possessive way. He may have lost so many things in his life already, and he doesn't want Sakura to be another one to slip away from him.
One reason could be that he sees something special in Sakura. Maybe he admires her strength or her kind heart, and he doesn't want to lose her to someone else who might not appreciate her as much as he does.
Another possible reason is that he has a sense of competition. He might see other characters as threats to his relationship with Sakura, even if that relationship isn't clearly defined yet. So, his possessiveness is a way to mark his territory and make it clear to others that Sakura is important to him and they should stay away.
Chapter 217, "Hesitation, Departure, and Sending Word (Part 2)", is the clearest early answer because it pushes Luo Cheng into a new phase or setting. It opens with Wu Tianxing's words once again plunged Chen Yingyuan into a quandary. and closes on Hand me the spear!" Seeing Xia Hong step out from inside the house,.... The key payoff is that the chapter closes with Luo Cheng's expression immediately fell, and he said, "I can't go alone. The Beehive isn't a good place.
Chapter 227, "The Scam at the Gate, Three Groups, and Yuwen Dao of Great Xia", is the clearest early answer because it turns Wu Tianxing's situation into a concrete plot event. The setup is Broadsword, close-fitting black clothes, could it be Yuwen Hu?, but the pressure keeps building through Jing Xian has been annexed by Great Xia, Yuwen Hu is certainly in....
Chapter 228, "Justified Campaign, The Infiltration Unveiled (Part 3)", is the clearest early answer because it turns Chen Yingba's situation into a concrete plot event. A useful checkpoint is the way the scene starts with But never expected, on the fifth day after he sent out the letter. and follows through with No matter how you look at it, it seems odd.. By the close, We've truly done it;
Chapter 306, "Helplessness, Shifting Loyalties, Total Annihilation, and New Territory", is the clearest early answer because it turns Cold Resistance's situation into a concrete plot event. The chapter turns that into something concrete by moving from Year 48 of Longyou, June 26 Four more hours until daylight. to They weren't foolish, once they were out of the ground, they quickly....
Chapter 282, "Humiliation and the Formation of a New Army", is the clearest early answer because it turns Zhu Xing's situation into a concrete plot event. The chapter gives readers a real answer by opening on Stop!" The two hurried towards the house, and when they were still... and ending on Li Wuqing was quite surprised, clearly never having seen Li Hu so....
Chapter 266, "Assessment Objective, Hell Level Difficulty", is the clearest early answer because Liu Peng finally turns buildup into a real advancement. A useful checkpoint is the way the scene starts with Their auras are similar to mine, also on the verge of a breakthrough,... and follows through with Although he knew what Liu Peng wanted him to say, he still....
Chapter 234, "Probing, Arrangements, and Hou Hu’s Confidence (Part 2)", is the clearest early answer because it turns Hou Hu's situation into a concrete plot event. Early on, Xia Hong had just swept his gaze over the people in the hall when Hou.... By the end, If Hou Hu wasn't wary of him at all, that would be strange..
Chapter 212, "Dispute—Can't Hold It?", is the clearest early answer because it turns Hong Yu's situation into a concrete plot event. The setup is After two years in the Beehive, Luo Ming hadn't attained elite..., but the pressure keeps building through Not only did he have his own independent dwelling in the Hive Main....
Chapter 271, "Eliminated, Breakthrough Surge, Green Lotus Grass (3)", is the clearest early answer because Cold Resistance Level finally turns buildup into a real advancement. The setup is With Great Xia's currently abundant supply of beast meat, Xiang Liang..., but the pressure keeps building through This time, it's just for gaining experience..
Chapter 329, "Refining the Jade Dew Stone, Eve of the Cold Element Festival", is the clearest early answer because it turns Li Xuanling's situation into a concrete plot event. The chapter turns that into something concrete by moving from Xia City, Political Hall Upon returning, Xia Hong immediately... to Li Xuanling refining the Jade Dew Stone in her body should have....