Nyaa to Nakukara Aishiteyo
Picked up a cat-like alpha on the street while drink. Later thought he was an Omega sex worker. There dark haired little Omega mangaka takes care of Tama who shows up every few days for food and attention like a stray cat. Finds out Tama was actually am alpha who only does sex work because he likes it. Tama gives him the collar Tama had been wearing so that he will feel more comfortable after knowing Tama is an alpha. He's starting to really care for Tama and Tama at the very least really likes him.
Altruist
High end of 3. Now to self: don't read again until it's finished. There's a couple who were sort of forced to invite others into their sex life and it doesn't seem to be an entirely happy decision for them.
Sore Demo Suki Desu Kasahara-san
Low end of four. Not bad at all. Just not sorry intriguing to me. Both characters were nice guys though. And there weren't any legitimate rivals trying to get between them.
Oyasuminasai No Ato Wa
This once is kinda sweet. But it's in a world that is shitty to omegas, so it's not my cuppa tea.
Ore no Kirai na Tsugaisama
High 3. Most of these relationships are twisted.
Tsugai ni Narenai!