MIN

There's only one that I've seen and it's unfortunately non con

https://www.mangago.me/read-manga/falling_alpha_enigma_the_fourth_bath/

NVM there's also this https://www.mangago.me/read-manga/alpha_no_chouinshiki/

I think alpha x enigma trope is still not familiarize in manga/manhwa community, so there's not a lot of them. The closest thing to it is just super dominant alpha, but majority of them has a omega love interest

https://www.mangago.me/read-manga/a_villain_is_a_good_match_for_a_tyrant/
https://www.mangago.me/read-manga/doctor_elise/
https://www.mangago.me/read-manga/i_will_seduce_the_northern_duke/
https://www.mangago.me/read-manga/concubine_scandal/
https://www.mangago.me/read-manga/priscilla_s_marriage_request/
https://www.mangago.me/read-manga/bring_the_love/
https://www.mangago.me/read-manga/i_raised_a_black_dragon/
https://www.mangago.me/read-manga/miss_not_so_sidekick/
https://www.mangago.me/read-manga/i_picked_up_the_second_male_lead_after_the_ending/
https://www.mangago.me/read-manga/charlotte_has_five_disciples/
https://www.mangago.me/read-manga/queen_cecia_s_shorts/