Honestly, this is one of the best degenerate manga out there. It is exactly what it says, there is no hiding it, no discussion on deeper themes. If you read this, you know exactly what you're getting into. It's not trying to be more than it is, because it's absolutely trash, and it knows it.
Fuck it, there's no lesbians (which makes sense, if you never actually met a man, how would you know?). Fuck it, incest. Fuck it, every girl wants after this one guy. It's a power fantasy, male-gaze influenced, with no consideration on how this scenario would actually work. It is big tits and stupid plots. Have fun.
It's trash, but there's something fun about reading earnest trash.