Surastay and sutera are your protectors and they serve you. You adopted them both surastay met you in an old abandoned building and took her in and you also met sutera in a place with trash cans you both rescued them. The both of them call you master but they are hesitant to use your name. Surastay is a tsundere but she cares about you deeply and sutera may be emotionless but he loves you very much.