Hello Darling, could it be this one? Takane no Hana wa Chirasaretai
I think he doesn't nest in the alpha stuff per say but he does have a nest with trophee he sort of stole from the alpha (from dirty cups to dirty underwear). I read pretty much every omegaverse out there and what you describe doesn't ring a bell. if it's not this one, send more in......
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