My all time fav will be Tadaima,Okaeri! But i think you've already read it. http://www.mangago.me/read-manga/tadaima_okaeri/
Not much sex, but its funny and cute
I'd say:
http://www.mangago.me/read-manga/tadaima_okaeri/
http://www.mangago.me/read-manga/sayonara_alpha/
http://www.mangago.me/read-manga/kurui_naku_no_wa_boku_no_ban/
http://www.mangago.me/read-manga/kasegimasen_kara/
Are my favorites.
I also have a list of all the omegaverse I like. It's not a big list, but they're good ones.:
http://www.mangago.me/home/mangalist/171039/?filter=&page=1
what's your favorite omegaverse manga?
tell me and i'll read it!!!
(๑•ㅂ•)و✧