The Omega is scenting him, and Daime knows that. He knows that the Omega isn't feeling well ever since he enters the bar earlier.
Daime doesn't know if the Omega knew that he is having his heat and that the scent of an Alpha would calm him down, so he let the Omega continue what he is doing until he feels better.
But then the smell hits his nose, and it feels like he had been hit with the freight train that is the Omega's scent; the unmistakable scent of an Omega in heat.
The Omega's scent is something else; Daime already knows he likes this Omega's scent.
The Omega's scent is addicting; it smells like strawberries and peaches, and vanilla passion fruit.
It is a heady scent that is more intense because of his heat, and it is making Daime dizzy. The scent travels through his body and goes straight to Daime's arum, making it twitch with a need for the Omega.
"Mr. Andrei, wait. You need to stop. You are-"