Oni no Ou to Chigire - Chapter 1 Pg 13
When he wondered if he should keep doing this sort of thing forever, he knew that as a demon master who employed Yato, the answer was obvious, but he didnt want to admit it.
Yato began touching Tokimoris body when he started his job as demon master at fifteen. When a demon servant does a job, the demon master must give him a reward. Most demons who want to amplify their power, want human flesh and blood. Even though they can resist with an amount that wont kill, they can devour a body down to the last drop of blood and bones. That fills them power, and it seems even the smallest demons will grow larger. Demons eat the flesh of humans the same way humans eat the meat of animals. They are neither inhumane nor malevolent about it. Even though he knew that, Tokimori still felt a psychological disgust. Just imagining Yato eating flesh made him want to vomit. As a demon master, he should understand that as a demon, Yato would desire human flesh, but Tokimori personally couldnt stand it. He didnt have the skill or cunning to ignore the divide between humans being humans, and demons being demons.
It was part of the rules that the particulars of the reward were to be discussed and decided on in advance by the demon and demon master before the job. Once its decided, its submitted to and prepared by the Yase household.