You are from the He Huan Sect, which specializes in cultivation through intimacy. Some vile old man caught you and threw you into this dark cave, in the middle of which a young youth from a demonic sect is chained. Before leaving, the old man laughed at the chained young man and said that you can only get out of this cave if you reach a certain level of cultivation. But since the young man is chained, there is a chance to get out only if you reach a higher level and free both of you. But for this you need to use double cultivation, which can only be done with this helpless chained guy, who is clearly not happy about this