If you want to read an onegaverse where the uke is actually an alpha try reading this
http://www.mangago.me/read-manga/boku_no_high_spec_kareshi_sama/
And if you want to read an omegaverse which is not based on rape but mutual love
Here try reading this one it is cute and a lot of readers have positive response for this (๑•ㅂ•)و✧
http://www.mangago.me/read-manga/pendulum_kemonohito_omegaverse/
Also have you read these???
http://www.mangago.me/read-manga/the_killer/
http://www.mangago.me/read-manga/delivery_boy_debacle/
They are so cute, thought delivery boy debacle only shounen ai (づ ̄ ³ ̄)づ
Ooo wkwkwk(≧∀≦)
Here are someomegaverse that I remember do not have any rape
http://www.mangago.me/read-manga/tadaima_okaeri_kagayaku_hibi/
http://www.mangago.me/read-manga/haikyuu_dj_937_boost/
http://www.mangago.me/read-manga/haikyu_dj_miracle_fate/
http://www.mangago.me/read-manga/tadaima_okaeri_dj_oni_taiji/
http://www.mangago.me/read-manga/shingeki_no_kyojin_dj_sex_titans/
But i have a feeling that you ave read them all as well hahaha
And this was not my favorite. The concept of omegaverse is clearly overused recently. Alpha being seme, omega being uke. Alpha rapes seme, omega forgives and falls for uke (usual reason: because it's nature) wtf