Hear me out..

If you scroll to the bottom of either of those, there is a tag that says omega verse. It will take you to all stories that have omegaverse.

OMEGAVERSE
http://www.mangago.me/read-manga/shounen_no_kyoukai/
^ personal favorite, sadder read
http://www.mangago.me/read-manga/kashikomarimashita_destiny/
http://www.mangago.me/read-manga/unromantic/
http://www.mangago.me/read-manga/like_a_tidal_wave_from_pheromone_shower/
http://www.mangago.me/read-manga/remnant_kemonohito_omegaverse/
http://www.mangago.me/read-==-manga/boku_no_high_spec_kareshi_sama/
http://www.mangago.me/read-manga/takane_no_hana_wa_chirasaretai/
http://www.mangago.me/read-manga/kasegimasen_kara/
http://www.mangago.me/read-manga/omae_no_koi_wa_ore_no_mono/
http://www.mangago.me/read-manga/keeper_of_the_pearl/
http://www.mangago.me/read-manga/kurui_naku_no_wa_boku_no_ban/
http://www.mangago.me/read-manga/hanagara_tsumi/
http://www.mangago.me/read-manga/kekkon_shite_kudasai/
http://www.mangago.me/read-manga/unmei_no_kisu_wa_oazuke/
http://www.mangago.me/read-manga/kedamono_arashi/
http://www.mangago.me/read-manga/kurui_naku_no_wa_boku_no_ban_beta/
http://www.mangago.me/read-manga/alpha_ga_alpha_wo_daku_houhou/
http://www.mangago.me/read-manga/haga_kun_wa_kamaretai/
http://www.mangago.me/read-manga/hyacinth/
http://www.mangago.me/read-manga/maku_ga_oritara_bokura_wa_tsugai/
http://www.mangago.me/read-manga/sayonara_alpha/
http://www.mangago.me/read-manga/love_shuttle/?iW04
http://www.mangago.me/read-manga/kiraide_isasete/
http://www.mangago.me/read-manga/unmei_ja_nai_hito/

Check out my m preg list that does have a lot omegaverse:
http://www.mangago.me/home/mangalist/958058/