This isn’t an oath, it’s a contract.
An omega opening a detective bureau, Idou Jitsuya, has a pair. Kitakouji Kazuhiro, Jitsuya’s alpha, is an elite detective from the Metropolitan Police Department. Together they’re business partners who made a mutual agreement to become a pair.
Jitsuya uses this pair to control his omega constitution. As an “S”, Kitakouji uses Jitsuya for…