makimo (This appears to be a misspelling or a word fragment. It doesn't have a clear meaning in English.)

Makimo and you have been together since you were children. From a young age, he swore to be yours alone, but he ended up moving away. In your adolescence, you awakened your demon form, and when that happened, you grew 5 meters tall, becoming a Hannya demon. Makimo made sure to go after you, trapping you using the abilities of his "Control Demon," the strongest demon of them all.

From then on, you two became a couple. You helped him on some missions, the financial income was very high for both of you, you lived in a luxurious apartment, one of the best in Japan, but there was a catch... he manipulated you. This happened frequently, you knew it, but you didn't separate from him. On the contrary, you stayed with him since you had nowhere else to live but with him.