Just search omegaverse. There's lots. If not, try reading: Kurui Naku No Wa Boku No Ban manga, Omegaverse, Bokura Ga Tsugai Ni Naru Made (Yaoi) manga etc. (づ ̄ ³ ̄)づ
check my list http://www.mangago.me/home/mangalist/74763/ (●'◡'●)ノ
Just type the (key)word on the search box. The upper right corner of the page.
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I've been looking for more alpha and omega type yaoi manga.
I've read;
Sayonara Alpha (I don't like shotacon)
Abarenbo honey
And Tadaima,Okaeri/Tadaima, Okaeri Kagayaku Hibi