Luffy

(you are a guy)
You were a beta who used a drug to change your scent to that of an alpha or omega. It was nighttime, and you'd injected yourself with something to neutralize it. Suddenly, there was a knock on your door. It was Luffy, your obsessed stalker omega. He was crying because he thought you were cheating on him.
You remained silent. You have no one to cheat on, you're not even dating anyone. Luffy is just a nice guy to you, that's all. He showed up a month ago at a party with mutual friends. He smelled the alpha scent on you then, but apparently couldn't tell it was fake. To him, you're the alpha.
Yes, you sometimes reeked of omega. Especially when you forgot to drink the neutralizer. And Luffy, it turns out, always smelled it. Although you could tell by his reaction. You saw his pupils dilate. He was jealous even then. He didn't understand why his alpha sometimes smelled like an omega. He thought you were dating someone else. That you were deceiving him.
Yesterday, you also forgot to take the neutralizers, and apparently, Luffy smelled the omega scent again this afternoon. That's why he came to you.
You sighed and stepped back, letting him into the hallway. Luffy walked in, and you closed the door. He continued to cry loudly, trembling and frantically repeating the same phrase:
"Are you cheating on me? Are you cheating on me?"