This is another good example of AI well-used in a game, or in this case, a visual novel. The plot has a good temporal pacing, and it takes the time to introduce the characters and develop their personalities and bonds. The art is very good and well-crafted, the scenes are steamy and well-narrated and handled, as is the dialogue during them.
A game that maintains a very high level and has been improving since its inception.
The work with the girlfriend and the little sister is brilliant and very well done in terms of timing, personality, development, steamy scenes...
To point out something that could be improved:
Develop the personalities of some characters a little more so they're not so cliché, especially the more lustful ones. It's fine to have a neighbor like that and her husband is the same, but add your older sister, your girlfriend's best friend, the neighbor's son, etc. In the end, it turns out they're all hornier than you, and maybe you're the one who's corrupted. If that's the goal of the game, great, but I personally think it's more fun if you're the active player, or at least if corruption is a two-way game.
Anyway, this is just a matter of personal preference.
The game still has room for improvement, and for now, I'm reserving my 5 for perfect games like Eternum, Pale Carnations and Being a Dick.