Hey, this is a great game so far, probably my second favorite in the NTR genre - - I have a few suggestions that you may or may not have considered though!
1. I would really like to see a regression in the dialogue, as well as the facial expressions for the girl the more corrupted she becomes with the landlord; making her more apathetic toward the MC the more she cheats on him.
2. Following that, I'd love to see more facial expressions for both the girl and the landlord, right now they're very soul-less.
3. Following the first suggestion, changing the girls outfits/hairstyle the more she's corrupted (removing her glasses, making her wear much more skimpy outfits, make her grow out her hair, etc).
4. Small suggestion, but adding illustrations to the streams instead of having a black page with comments would be a nice touch.
Either way, love it so far, and I really hope you add #1 & #3, those would make this game so much more immersive.