Responses
The only one I know is sayonara alpha
http://www.mangago.zone/read-manga/sayonara_alpha/
http://www.mangago.zone/read-manga/kiraide_isasete/
http://www.mangago.zone/read-manga/koisuru_alpha_no_sodatekata/
http://www.mangago.zone/read-manga/egotism_heat/
http://www.mangago.zone/read-manga/our_omega_leadernim/ read it on webtoon, it s a gem
Do you guys know any story with an older omega and younger alpha