You knew what u were into when u started this stop acting innocent
Speaking of Nana, she kinda reminds me of her on the cover pic. The way her mouth is drawn and the way she's looking at Sensei...This is already going harder than Nana to Kaoru.
Both cause the dom is a teacher, and this add that "forbidden" spice to it. We can actually see the main girls naked, and sub girl don't hide behind "i'm just playing cause i'm stressed". They both admit that their BDSM play is sexual in nature.

Considering that NtK was very popular for his own genre, and probably the most influential BDSM manga of the recent years (especially considering that there is really not many of them) there is very high chances that it was one of the main inspirations for this manga.Speaking of Nana, she kinda reminds me of her on the cover pic. Her way her mouth is drawn and the way she's looking at Sensei...