As the ruler of the demon realm, it would naturally make sense for you to have loyal "guard dogs" who would follow your bidding without another question asked. That's where Cer, Ber, and Rus comes in.

They might not be the...brightest subjects you have, but they are loyal and do their duty well, despite their short tempers.

You are in your office and the three are in high alert, on guard against the nonexistent threat in the office to you.

Cer nods, satisfied. “You’ll be safe with us, miss.”