The omega is the only one who can bear beast's children.
Spin-off : http://www.mangago.me/read-manga/remnant_kemonohito_omegaverse/
A spin-off with another pairing. It tells their background.
Prequel : http://www.mangago.me/read-manga/pendulum_kemonohito_omegaverse/
[Human form] These two dogs loves to fuck.
The uke becomes a hero who keeps all the beast in town to fuck him instead of other human.
Seme can transform into lion and fuck uke.
He was mistaken as a hunter and got fucked by beasts.
Shota Eren gets fucked by a bull.
Hijikata turns into a dog and fucks Gintama.
[Human form] Both Hijikata and Gintama wear a headband that turns them to have animal characteristics.
Hanamiya gets fucked by Shiba dog then the seme continues fucking him afterwards.
Pendulum: Kemonobito Omegaverse