If We Cross Each Other Every Three Days, Am I Becoming a Big Devil?

"What should I do when I open my eyes and become the senior sister of the Demon Sect? Waiting online... It's quite urgent!" Qin Chuan discovered that his souls and those of Su Yuan, the senior sister of the Demon Sect, were intertwined. Later, he discovered that their souls would interpenetrate each other every three days! On this day, Qin Chuan returned from time travel and found that he had become a demon emperor! Qin Chuan: "Damn... This bitch has something!" Su Yuan: "Hmph... Wait until this bitch crosses the starry sky to find me, and I'll see if I don't drain your soul and refine it!"