Kurui Naku No Wa Boku No Ban
i DUNNO WASn't my cup of tea. About an alpha that starts working at a new company, realizes that his boss is an omega, that also sleeps around to get to the top.
Abarenbo honey
Megumi and Tsugumi
Alpha no Ie no Ko
About an alpha who had a fucked up life growing up because his "elite" family took his parents away from him and tried to convince him that omegas are inferior. However he is a nice guy and tries to break the family view on omegas, and falls in love with an omega who already has a child, and also he takes care of his little brother who gets kicked out of the household cuz he is an omega.
Kozure Omega to Boukun Yakuza
An omega with a child has to pay back a debt that his so called "fated pair" has taken. The yakuza alpha starts liking him and starts taking care of him, they eventually pair and the omega gives birth to his child as well.
Pop One's Cherry
About an omega who fucks alphas to teach them a lesson. He also avoids his childhood friend who turned out to be an alpha, however his friend always comes to him and pesters him. One day when the omega is in heat, they endure it together and when the alpha leaves the omega starts masturbating smelling the alphas jacket, that the alpha forgot. However the alpha comes back to that sight :)
Boku no Omega yo Samenaide
A beta that is only 10% omega so he is an omega only not prominent, he gets his first heat when he starts living together with an alpha.
I Found You, My Omega
Yankee Ω wa Kemono Ou-sama no Mono!
A delinquent gets sucked into another world through a mirror. He then ends up saving a guy who turns out to be an alpha and a royalty. The alpha tells him that he is his fated mate, turns out his body changed when he got sucked into this world and he became an omega. Long story short they live happily ever after. Felt like this story was milked.... Didn't like it. It could have been short but nope.
Romantic Joutou