It could vary a lot. Sometimes it's a partnership for survival against other vampires. Or it could be a strange attraction based on the boy's unique qualities that the older girl finds intriguing in this vampire-themed manga.
The relationship might be one of friendship, where the older girl guides and protects the young boy in the vampire world. Or it could be a darker connection, with the older girl having ulterior motives for being with the boy.
The best chapter pointer here is Chapter 169, "This is What Happens to Show-offs!". It opens with Everyone: "What?!" Seeing the shocked and bewildered expressions on their... and closes on Wen Jiaojiao, as if to prove herself to Jiang Li, rolled up her sleeves....
If you want the clearest chapter reference, go to Chapter 147. Early on, Xiao Xueyi nodded in agreement after listening.; later, the chapter leans on Su Yinwan seemed to have matured overnight, becoming more and more adept....
The best chapter pointer here is Chapter 205, "The Fairy Descends to the Mortal World". It opens with Ah Fu had no idea what the video Jiang Li mentioned was. and closes on Having such a sister certainly would bring happiness..
If you want the clearest chapter reference, go to Chapter 152. Early on, While most of the villagers of Chixia Village were gathered at the village...; later, the chapter leans on The unassuming structure stood out oddly against the backdrop of its....
Chapter 189 is the strongest chapter-level answer because it starts from Seeing his painstakingly planted roses trashed like this, even as a fan of... and follows through on Just after coming out of the bathroom, he saw the landlord's family all....
A practical answer is Chapter 166, because it turns the idea into a concrete scene. The chapter opens with Only after everyone in the small courtyard had left, did Zhao Lang stride..., adds pressure through Fans can't bear to watch anymore.], and ends on However, after interviewing the villagers.
If you want the clearest chapter reference, go to Chapter 152. Early on, While most of the villagers of Chixia Village were gathered at the village...; later, the chapter leans on The unassuming structure stood out oddly against the backdrop of its....
Look to Chapter 170 for the clearest answer. It begins with Watching the two who had long remained silent, the PD shifted his position..., keeps building through If you don't set off soon, you'll probably miss lunch." Hearing this, Su..., and lands on [Didn't the other guests also do farm work in.
A practical answer is Chapter 132, because it turns the idea into a concrete scene. The chapter opens with The new girl in the live-streaming room went crazy., adds pressure through Stay away from my fragrant and fresh Brother Daniu!] [Not only has the..., and ends on He stir-fried the other.
If you want the clearest chapter reference, go to Chapter 211. Early on, Advanced Repair was even more outrageous, costing a whole 30 points.; later, the chapter leans on Not to mention the 50 points for Supreme Repair..