Life as the Demon Lord's Concubine [Book Transmigration]

Qing Yu transmigrated into a book, but into the wrong book. The System told him he'd entered The Demon Venerable's Sweet Little Wife, and that he had to become the male lead and make the Demon Venerable fall madly in love with him. Just as Qing Yu was busily using his looks to seduce him, the Demon Venerable suddenly called him "Master..." Qing Yu: "???" System: "Beep beep. Virus cleared. Host is now confirmed to have transmigrated into The Demon Venerable's Road to Revenge. Host's identity: the Demon Venerable's master, his greatest enemy." Qing Yu: "???" In his previous life, Lu Wenyu followed his master's orders and infiltrated the demonic sect alone, nearly losing his soul forever. After enduring countless hardships and becoming the new Demon Venerable, he planned to follow his master's instructions, disband the sect, and hand it over to the righteous path, only for his master to stab him through the heart with a sword. Reborn just before the sect was to be handed over, Lu Wenyu finally saw his master's true colors. He was nothing but a stepping stone. In that case, he would capture his master. Humiliate him. Trample him. But... Master... why are you taking off your clothes? The vengeful Demon Venerable blushed.