This is pretty damn run-of-the-mill for a yaoi, with a thin plot that's there to lead to the sex, and even that happens right in the first chapter. The art's fine. The best character is Aki's FWB, because he saw how ridiculous the entire situation is and just had fun with it.
I didn't like how Akihiko (Aki) takes advantage of Aiichiro (Ai)'s feelings for him (it's explained later on, at least), while Ai cries and mopes until Aki accepts him—even Aki points out that Ai doesn't listen to a word he says, and just does what he wants. Ai also has some strange views, like wondering if it's "unfaithful" because they had sex outside of dating officially (but neither was sleeping with anyone else, so...?).
And, of course, we can't have a character that is simply happy with no-strings-attached sex, without wanting a relationship — no, of course he has to have a trauma related to sex, that is healed so that he can be "fixed" into a relationship.
Of course, it all ends in a generic happy relationship, but comes across as empty because we see no bonding moments between them—all they do is work, have sex, and argue. The story carries this unpleasant vibe of "Ai knows better what Aki really needs", because the opposite is communicated explicitly within the story and because the spoilered plot device is tired and overdone. Again, this is just run-of-the-mill for yaoi, which Isn't That Deep, but it was still annoying to read.
I powered through it but was already bored by chapter 2.