beta
alpha (originally beta) x omega
omega x alpha (maybe)
I've "read" the raw. The implication does seems like the omega is the top, and the omega does imagine to be the top. BUT there is no actual prove of that even until the last chapters. There is no sex scene, only masturbate with each other with their d. there are character growth. the omega as tall as the teacher after graduate. The omega is the one pursuing the alpha teacher, which made people think it like that. I can't say for sure unless it is translated.
Alpha x Beta
Omega (raised as an alpha,alpha turned omega) x Alpha
Note: in this manga universe, there's multiple cases where alpha can turned omega and vise versa. Which in this manga, the seme is an alpha who turned omega. his whole appearance and attitude is an alpha as he was raised to be one since birth but then unexpectedly transition into omega. while the uke alpha is not much of a dominant alpha.
Gay Alpha (Seme), Straight Alpha (Seme obv cuz he's straight)
Seisansei no takai futari no seisansei no hikui seikatsu - Hypnosis Mic dj