http://www.mangago.me/read-manga/shingeki_no_kyojin_dj_hangyaku_unmei/
This is kind of what you're looking for, hope you like it
Lol, only one I could think of to. Wish there was more variety out there.
There's an omega/omega pair in here:
http://www.mangago.me/read-manga/sukijanaitte_hyakkai_tonaeta/
Definitely unique storyline and that beta husband sure has patience ╮(￣▽￣)╭ but why would that alpha guy wants to have so many mates and children. He is so creepy omygod
Love love beta x omega. Its always alpha x omega. Anyone know any story where omega is actually the one do the fucking? Doesnt matter with beta or alpha. I really wanted to see omega dominate the relationship once in a while.