My current fav is kiraide isasete, but this one is quite soft.. you can try to read these: There’s no way this is fate and Nindan - Danshikou de Ninshin Shita Ore.. sorry but both are long chapters yet worth it!! ლ(´ڡ`ლ)
Abarenbo honey
It's a Delinquent omega x alpha
Was in heat in beginning and in one of last chapters, not that much smut I think
http://www.mangago.me/read-manga/abarenbo_honey/
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Like a Tidal Wave - from Pheromone Shower
It's a alpha looking omega and he tops alphas too
Kinda in the middle, so u have to decide for urself, otherwise a very good omegaverse
http://www.mangago.me/read-manga/like_a_tidal_wave_from_pheromone_shower/
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There's No Way This Is Fate
Omega thought he's an Alpha, two Alpha friends are in love with him and was in heat too
http://www.mangago.me/read-manga/there_s_no_way_this_is_fate/
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Kanraku Alpha ~Enigma~ 4 verse
An Alpha turns into an Omega
Heat in beginning and throughout it too
http://www.mangago.me/read-manga/falling_alpha_enigma_the_fourth_bath/
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Alpha ga Alpha wo Daku Houhou
Alpha x Alpha
Was sprayed with omega pheromones so one of them wanna fuck the other one, but that since beginning
http://www.mangago.me/read-manga/alpha_ga_alpha_wo_daku_houhou/
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The following are just really good omegaverse with nice smut
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Imitation Mate
Alpha x Alpha, one of them turns into a omega
http://www.mangago.me/read-manga/imitation_mate/
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Omae no Koi wa Ore no Mono
Big omega x alpha
http://www.mangago.me/read-manga/omae_no_koi_wa_ore_no_mono/
Good omegaverse that have less than 20 chapters where when the uke has his heat the seme can't control at all like he's completely crazy because of the heat....