Restless Webtoon
8/02/22: Read this for the the second time! It's been a while but I wanted to revisit out of the blue. Omega verse can be so gross but this author makes even that end up wholesome. This does have dubcon, rape, & attempted assault as part of the world building for what the omega MC experiences. It isn't anything traumatic but fucked up & it is handled well by the author (only shows what's necessary, doesn't sexualize it. Even for the dubcon, the MC omega still gives verbal consent but its for a miscommunicated wrong reason).
Kowamote no Rinjin ga Ω datta Toki no Taishohou
A discovers his feisty, scary neighbor is actually an omega. MC is an alpha with a special condition whom only the uke trusts. Uke requests sex to help with his heats, and the two's relationship kicks off from there. Seme becomes more drawn to uke through the encounters but wants to get to know uke. He has his work cut out for him as he tries to penetrate the uke's feisty exterior. I love a scary, tough looking uke/ omega. Seme is a green flag who cares for uke.
How To Be An Alpha