Help finding an omegaverse BL

I'm looking for this specific black and white manga where they are still in school. They're friends but the omega doesn't know that his friend is an alpha. I remember this confrontation where another alpha is about to assault the mc omega and the mc alpha is there but hasn't made his 2nd gender known so the mc omega tells him to run instead but, plot twist, bad alpha tells me omega that his friend is one of them. They end up on a rooftop and mc alpha has to mate him so the others that followed leave.
Help finding would be appreciated!!
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