This specific title belongs to a niche sub-genre of adult media focusing on "hot mothers" or age-gap romance within family structures. Kanojo no Okaa-san wa Suki Desu ka? Do You Like Your Girlfriend's Mom?
If you’ve found yourself in this predicament, you aren't alone, but you are in a very delicate spot. 1. The Science of the "Upgrade" My Girlfriend-s Mom Is Much Finer than Her- So ...
If you want to take this in a different direction, let me know: This specific title belongs to a niche sub-genre