Omegaverse:
https://www.mangago.zone/read-manga/turning/
https://www.mangago.zone/read-manga/smyrna_capri/
Not omegaverse but royal/fantasy settings:
https://www.mangago.zone/read-manga/sweetie_sweetie_sweetie/
https://www.mangago.zone/read-manga/the_moon_painting_alchemist/
https://www.mangago.zone/read-manga/eternal_covenant/
https://www.mangago.zone/read-manga/the_fallen_duke_the_knight_who_hated_him/
https://www.mangago.zone/read-manga/how_to_raise_a_victim/
https://www.mangago.zone/read-manga/to_deny_the_route/
https://www.mangago.zone/read-manga/how_to_survive_as_a_player/
https://www.mangago.zone/read-manga/stuck_in_my_sister_s_dating_sim/
https://www.mangago.zone/read-manga/two_empires_the_slave_of_the_empire/ (Lots of trigger warnings and angst for this one so not really recommended if you are looking for something funny)
smth like the rougue prince is secrety an omega and who's your daddy. I love the art and the royal settings, if u kniw any like em