So lately I started reading omegaverse. And I wonder, can an omega be a seme? Does a manga...

Well I have stumble across a manga like that but I forgot the title so yes those type's of manga exist

There is.. I read one where the omega is seme and the alpha is uke.. but unfortunately forgot the name, I'm weak in remembering name or title

Ohh there's a fan service in this extra chapter
http://www.mangago.zone/read-manga/eunsuk_jung_gu/nmt/c052/

Yes it exists.
http://www.mangago.zone/read-manga/ai_to_makoto_moriyo/
There exist more but I can't find them atm.

http://www.mangago.zone/read-manga/boku_no_high_spec_kareshi_sama/ I think

OH HOW I LOVED THIS

What i found is an omega brothel who turn out to be an sadist omega or called queen and alpha that play role as masochist..

Well that only thing i found unusual in omegaverse...hahaha tbh i laugh when reading that

Sutenaide my hero

Try out the manhwa, though the art is that good or detailed but it's cute! And the story is worth the reading especially if you are sad and need staff to make yourself laugh

I've already read this actually and its one of my favorites! ヾ(❀╹◡╹)ﾉ~

Oh goodness, I've already read some of your suggestions and I'm in love!
Thank you all very much (っ◔◡◔)っ