Well, like others have said countless times, the game certainly gets into cheating and the sex quite quickly. Which itself is not necessarily a bad thing or wrong way to approach it but I feel it needed at least a little something extra for it to feel more satisfying.
Now, I don't have experience making a game or think I would be a good writer but I think even one short scene before the events at office would have helped it a lot. So if I had to change as little as possible while trying to make it seem believable, I would have started the game with little scene between female protagonist and her husband, where they are having or trying to have sex. Specifically trying to showcase their loving relationship but also the lacking sex, which could be for multiple reasons:
a) Husband having small/(er) dick
b) Husband lacking skill in general
c) Husband having less time/more tired recently
I guess these 3 were from the top of my head and probably the most cliche options but one of these in combination with female protagonist being hornier/lusting after sex more than your average woman and I feel the first office scene would work out a lot better. Maybe a little more guilt/reluctance as well during the first few encounters with the boss.
Apart from that I liked the first hour of gameplay and the female protagonist looks amazing, like really amazing so great job with that