The difference between these two stories and their subject matter is that AL felt much more grounded in reality and this story, while grounded in certain places, is less grounded in other areas, such as what's going on with the HOTs. Again, it speaks to DPC's inspiration of those American comedy college movies because whilst the characters can portray very realistic traits and attributes, and the settings can also very realistic, the events and antics they get involved in are often farcical and/or contrived due to their outlandishness.
As such, when something seems less believable, like a sorority selling drugs and sex, you can more easily divorce yourself from the reality of it because it is less believable. AL, on the other hand, rings much more true to real life and there isn't much of anything within that story that feels particularly unrealistic, thus giving it a much more "heavy" feel than this story because it sets a very different tone.
We can say "never" on a harem because we've been told as much, so a poly/throuple relationship is the best we can hope for in this game.
Because he's kept her pure? Is that what people are going by? Because it's the only thing I could point to if push came to shove.