I Have Been Working Under the Demon Lord for These Years

[Travel Girl VS Demon Lord + Demon Lord as younger brother + CP] Who understands! Social animal Yun Xuan'er traveled through the world of immortality, and was bound to the hell-level mission of "Preventing the Awakening of the Demon Lord" at the beginning - but he had no experience for the first time. He watched the mortal form of the Demon Lord Su Luo awakening, and the mission collapsed immediately, and he followed suit! Fortunately, the system gave me a chance to be reborn! This time she opened the book with a bang: as soon as she came back, she blocked Su Luo, who had not yet matured, signed a master-servant contract without saying a word, and locked the future demon lord as his "exclusive younger brother"! Before she could breathe a sigh of relief, the "Demon Lord's Awakening Alert" was filled up, and the system kicked her to travel for the second time - this time she ran into the teenage version of the Demon Lord's Yelian Jue! The young man's eyes were full of anger, and he was bitter and resentful. Yun Xuan'er decisively re-enacted the operation and asked the Demon Lord to "second brush" the identity of his younger brother, focusing on "getting from the root"! In order to collect the five orbs that seal the power of chaos, the daily routine of the two of them breaking through the dungeon was more exciting than opening blind boxes: one second she was still doing sect tasks, and the next second Su Luo silently took away the mess she had made; while keeping an eye on Su Luo in fear of him suddenly awakening (this is a time bomb that can blow up the world of immortality), at the same time, when Su Luo blocked the danger for her, her heart beat like a drum. Until one day, Yun Xuan'er looked at the "little brother" who gave her a birthday gift in front of her, and suddenly panicked: Is this the obedient and reliable Su Luo, or the murderous Demon Lord Ye Lian Jue in the future? I'm here to prevent the Demon Lord from awakening, but why can't I tell whether I'm doing a mission or am I attracted to the "unawakened Demon Lord"? Can this shitty mission be completed?