I Picked up a Little Beggar and Turned Out to Be an Ancient Mythical Beast

What? Want to be a mother? The five-year-old child I picked up has grown up to be a slim, cold-hearted, sinister, and highly-cultivated ancient beast in half a year. She also wants to take me to the God Realm to be my wife. He chases me and I run away, and I run away and he chases me. Later I find out that I have been bound by countless reincarnations...