Okay, I got a few:
https://www.mangago.zone/read-manga/help_me_teacher/ short and pretty much pwp. Also 3p
https://www.mangago.zone/read-manga/zettai_fukujuu_meirei/ this isn't TECHNICALLY omegaverse but it has the same vibes but instead of alpha/omega it's dom/sub and holy shit it's good
https://www.mangago.zone/read-manga/the_mating_season/ Same as above, not TECHNICALLY omegaverse, but he takes this medicine that gives him a heat. V interesting and spicy.
https://www.mangago.zone/read-manga/omega_wa_pink_no_yume_wo_miru/ This one has a bit of drama but is an actual omegaverse. Definitely good.
https://www.mangago.zone/read-manga/alpha_ga_alpha_wo_daku_houhou/ I am IN LOVE with this one omg, so hot.
I tried to narrow it to only the omegaverses that have smut as a main plot point. Hope you find something you haven't read before :)
PLEASEEE RECOMMEND ME SOME HOT & SPICY OMEGAVERSE, ONEGAIIII XDXDXD
(≧∀≦)