My Covenant With The Monster Lord

Yu Yin was reborn yet again in the immortal world where he used to belong. An unfamiliar demon master, however, decided to mess with him. He even bit him and forcefully made a contract with him! Yu Yin was shocked while the demon master was impassive. Bei Xiao: "Now that we are already in a relationship. I must fulfill my responsibility! " Yu Yin: "No, thanks."