I'm Not the Prince of the Mountain Stronghold!

(Female-dominant world + fantasy + angst + female Demon Emperor + immortal senior sister + unstable master + sisters + System appears only later) Su Yan was the Dao Sect's Holy Son. By a twist of fate, he and his senior sister Su Ningshuang are captured by the Demon Emperor Chu Mengyao and taken to the Demon Realm. During their time there, he becomes intimate with Chu Mengyao's younger sister, Chu Qingchan, but Chu Mengyao's pregnancy hits Chu Qingchan hard... With the great demon-clan tournament fast approaching, Chu Qingyao has no choice but to release Su Yan and his senior sister for now. But Su Yan knows this isn't the end of the nightmare. It's only the beginning... But is the Dao Sect still his Dao Sect? Is his master still his master?