Humor is good.
Design for the girl characters are pretty good with few of them changing apperance over the series.
Most of them have distinctive likeable personalities and quirks.
I like the beginning of the manga when the MC is banging girls one by one trying to work himself up to bang his sister.
However, when they started to add another class of girls into the roster, you can feel the quality of the manga just drop.
Plus, some of the fetishes can get uh, a little uh, ridiculous like diaper play.
Hopefully the author will return and finish this series.