Lin Xiaojie's appearance was like an alarm bell, shattering the last hesitation between the sisters. In the attic of the Lin residence filled with memories, two identical faces confronted each other, the air thick with the calm before a deal was struck.
1. The Blood Pact
"Rather than letting some outsider woman benefit, we should set some rules." Yuxi leaned against the window, toying with the roll of undeveloped film in her hand, her tone chillingly calm.
Yuhan nodded. The gentleness in her eyes had transformed into a bottomless resolve. That night, under the dim light, the two sisters signed a "three-point covenant" with no paper or pen—yet etched deep into their genes:
First, fair competition; do not harm the bond between sisters. No matter who wins Yu'an in the end, they would remain each other's closest other half in this world.
Second, absolute secrecy; never let the parents find out. This was the bottom line to protect their isolated island from being shattered by the outside world.
Third, whoever completely possesses Yu'an first (body and soul) is the final victor. The other must withdraw unconditionally and never raise any objection for life.
Finally, to ensure Yu'an would not be taken advantage of by the likes of Xiaojie, they established an almost insane rotation system: Yuhan would accompany him on the 1st, 3rd, and 5th; Yuxi on the 2nd, 4th, and 6th. "As for Sunday…" Yuxi smiled, the expression of a hunter closing the net, "it will depend on An's own fate."
2. The Rotating Nightmare
Yu'an knew nothing of this secret arrangement. He only felt that the atmosphere at home had changed—no more sharp arguments, replaced instead by a disturbingly regular pattern of "care."
Late Monday night. Yuhan pushed open the door, dressed in a plain white silk nightgown, sitting by the bed to change the dressing on Yu'an's injured hand. Her movements were slow and reverent, as if performing a ritual over fragile porcelain. That night, she naturally lay down beside Yu'an, her hand gently resting on his waist. "An, only when I'm here can you sleep peacefully, right?" she murmured in the darkness, her voice filled with serene confidence.
Late Tuesday night. It was Yuxi's turn. She wore earphones, forcibly sharing one with Yu'an. Leaning against his shoulder, she deliberately traced her fingertip along the edge of the gauze on his hand. "An, don't think about Sister. Tonight, you're mine." She was like a flame, trying to burn away every trace of coolness left by Yuhan.
3. The Vanishing Will
Yu'an felt like a disassembled machine part, being reassembled by different owners on different days. This "order" broke him more than the previous chaos, because he could no longer find anyone to resist.
He tried to fight the rotation, but whenever he wanted to push open the door, Yuhan would shackle him with "Sister's heartbreak," while Yuxi would whip him with "the photos from the darkroom." Trapped in a six-day cycle maze, he drowned each night in alternating tenderness and threats.
4. Who Is the Prey?
Late Saturday night, Yuxi left a final warning by Yu'an's ear: "An, do you know what tomorrow is? It's the only free day, and your last chance to choose."
Yu'an lay on the bed, staring at the shadows on the ceiling. He realized he had completely lost the ability to distinguish "exclusivity." Sometimes, he even wished the two of them would simply merge into one.
What he didn't know was that behind this "three-point covenant," both sisters were frantically calculating how to take the final step. They were competing to see who could cross that physical boundary first—who could stamp a permanent mark of ownership on Yu'an's soul and body.