Souteigai no Sweet Marriage
I don't know if it's completed or not. I just want to point out by the fact that the mc is honestly very mature and responsible in his actions. He was straight forward when he asked the ml whether he was gay (albeit the mc was drunk) but he didn't just stop there, he explained himself and that is the one thing I like. Usually, the suthor would make the mc run away without any proper explanation to the ml based on a theory that is not confirmed.
Then, after he woke up and thought over his issues more, he spoke to the ml that he needs some time alone. As soon as he realized that while he may still not sure whether he likes him or not, he didn't unnecessarily prolong this thing. Not only that he explained during his time away at work to ml about his thoughts, he also explained himself clearly when he came back to their home. I really like the communication in this. The sex scenes were sort of dubious consent but I am not sure. Still, I wish to read until it is completed because of how mature the mc is.
Secretary Jin's Confinement Diary