Found another one O.O Beta Count Has Changed Poly Omegaverse in which beta MC died after his husband was forced to be with an omega during his rut and then manifested as an omega himself after returning to the past (was supposed to be a short story but got many extras)
Found another one O.O Beta Count Has Changed
Poly Omegaverse in which beta MC died after his husband was forced to be with an omega during his rut and then manifested as an omega himself after returning to the past (was supposed to be a short story but got many extras)