The alpha saw an albino omega slave once as a kid and fell for him. As an adult he finds a locked shed. He brakes the lock on the door and goes in. He finds that albino omega in there. He starts to visit him. One day he finds him in heat. The alpha (who is a full-beast) had to impregnate a female full-beast lady (his wife - family royalty issues). However it turns out that the albino was supposed to be a sacrifice for luck during his wedding. The alpha ran away with the albino - abonding his family and pregnant wife - so he could be with this albino.
Kinai - Kemonohito Omegaverse