Not a big fan of ntr, so my opinion will be more subjective.
Actually I found this game good, but not really good or great for couple of reasons.
First, MC here (for most of the time) is just a plot device because of whom this is a ntr game. Poor guy dont even have a chance comparing with old pervs, but most important that he has no satisfying ending. Not like happy "and they lived happily ever after" ending, but one in which he would start to get some pleasure from what is happening.
Second, and its really subjective, there is not much variety of partners in the game. Like, c'mon, there could be more of middle-aged and old pervs. Also I personally find Leanna's Slice of Life and Yokino more interesting because in this games girl actually can choose who bangs her.