So cuteee

sayonara alpha was a geniunly adorable omegaverse,
if you don't mind the age gap and
*spoiler* they don't do anything until the seme is old enough (づ￣ ³￣)づ

Maybe "Love Shuttle" as well.
Love illusion is also anotehr popular omegaverse XD

If you want to cry and miserable bcs false mates try http://www.mangago.zone/read-manga/shounen_no_kyoukai/
If you want a genuine and extreme love until sacrifice smth try http://www.mangago.zone/read-manga/last_omegaverse/
If u want an omega with overdosing suppressants http://www.mangago.zone/read-manga/kurui_naku_no_wa_boku_no_ban/
If u want omega with mate bcs don't want to bother a beta that he loves http://www.mangago.zone/read-manga/kurui_naku_no_wa_boku_no_ban_beta/
If u want omega desperate to mate with alpha but he loves a close sex friend which is a beta (with kids)
http://www.mangago.zone/read-manga/romantic_joutou/
If you want omegaverse with rich family background (with kids)
http://www.mangago.zone/read-manga/kashikomarimashita_destiny/
http://www.mangago.zone/read-manga/kekkon_shite_kudasai/
And many moree (●'◡'●)ﾉ
I hope this helps