Probably "Turning"? It's the only one I've found that's interesting, I've read the novel and it's really good. It is an Omegaverse but focuses more heavily on the plot and their romance is a slow burn on the MC's side, emotionless MC too! I love emotionless MCs.
I'm so happy someone agrees! For me sexual scenes feels more interesting and worth it if it happens after a gradual building of sexual tension and chemistry, the way you'd yell out "Finally!" when it happens. Sex at the first chapters are just so so boring, so IF there are sex scenes, I prefer them to be a long way onto the story y'know?

I feel like the way the story is heading fits more into the yaoi genre, I originally came for the interesting premise and the Shounen Ai tag because I don't really read any type of smut because it's usually really boring for me.
But there are so many scenes that I feel like a sex scene would fit or naturally occur if you know what I mean, I do not like Yaoi but this story would have the potential to be one, in my opinion it should've been one.
Be as it may, the story feels really exhausting for me. The Guild captain reminded me of a pervy-er Sung Hyunjae from The S-Class that I raised so i initially had an interest at the ML, this is only my opinion but the way how their relationship is progressing is exhausting. This very much clear that he is only using the MC's naivete and consideration, i doubt he'd have interest if he wasn't a useful Guide to their Guild.
It's easily predictable that he would plan to use him at first, not minding the whole relationship and dates thing because he held an interest but will slowly but surely fall madly in love. The MC is honestly wayy to gullible, but I won't judge until I've seen his backstory which is probably the most intriguing thing in the story so far.
There would be probably some major character development within the characters but the whole dynamic currently feels like a rabbit in a den of lions situation, which I do not like.
Accompanied by the sexual implications, which I find very uncomfortable also. It's a shame, I enjoy guideverse and omegaverse stories but I do not like the smut in it even though it's probably like the main reason of it being created, I wonder when I'll find a good Omegaverse of Guideverse manhwa that is solely focused on the plot and romance without sexual scenes.
Overall this story isn't for me, I do not like how the MC is clearly being manipulated and tricked, I wish they let him in on their whole thing beforehand. But I understand, since the guild is filled with cunning strong people, it's natural they'd be cunning.
The only esper I like is probably Koda, he knows boundaries and were overall respectful.
I usually like these type of stories but this is just not my type of tea.