Omega wa Pink no Yume wo Miru
The Alpha liked his omega secretary and he ended up getting a potion to induce his heat. He put some of the potion in a water bottle and the omega gave ut to his friend and he went into heat and then they both did the devils tango in the bathroom. Later on he find out he had the potion to induce heat and gets mad at the alpha.
Kiraide Isasete
This one is so cute so the Omega got raped when he was younger and has a child. He starts working at a school I think as a janitor and one of the student's say that they are soulmates and the omega goes into heat at school but the Alpha protects him and bits his arm so that he won't hurt the Omega because he thinks all Alphas are the same. After they also have a child of their own.
Black Mirror
Idk why I really like it
Hogu Hagyeongsu