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I’m looking for this manga/hua/hwa

I dont really remember what they look like but the omega was a janitor and the alpha was a student.
This alpha really liked the omega and on another chapter the omega let out his pheromones and almost got raped by some students, but the alpha saves him and he was hugging the omega while biting himself to prevent himself from r*ping the omega. Next thing they were in the clinic/hospital and they don’t remember anything.