Ypu probably know this one but here it is:
http://www.mangago.zone/read-manga/kashikomarimashita_destiny/
The secondbcouple is alpha×beta and is da beest
http://www.mangago.zone/read-manga/kashikomarimashita_destiny/
first few chapters are an alpha-omega relationship, rest is centered around an alpha-beta relationship where the alpha is pursuing.
@bluellie and @hudksbfknc that's what triggered this rec request, i totally forgot to write that part in the initial comment Σ(っ°Д °;)っ
Do you know any omegaverse manga where the pairing is an alpha x beta, preferably one where the alpha is the one pursuing le beta?