Replying...
Intro. Sanji and law were a couple. An alpha law and its omega sanji. The time on sanji's neck was the clear time of law that it is his omega. Through the marking you had a bond where you can feel and communicate with each other even at a long distance. Despite everything, neither of them felt completely like they were missing something. You are an omega and work for law as an assistant and receptionist. What the two were missing is a third omega. In your heat, sanji can smell your smell, which an omega can't do.

Law x Sanji x Du (Omegavers)

@Suki