Omega MC is abandoned by his family at a young age because he comes from an alpha family and omegas bring dishonor, the parents drop him off with the beast-men because it is a well known fact that beast-children can only be born from a human omega. The MC is raised by beast-man Ruado who treats him very well, though Ruado knows one day his heat will come and the boy's innocence will end. Luckily, the two end up being soul mates which allows Ruado to claim the omega as his, the fear of the omega being passed around during his heats is gone and the two can live happily as a couple.
Pendulum: Kemonobito Omegaverse