純愛フェチズム [Junai Fetizm]

純愛フェチズム [Junai Fetizm] - Takashi Kanzaki, 神崎貴至 Apparently this is a sequel (I did not read the first one yet). It is about an established couple, both professors, who spend pretty much the entire manga doing it. Yes, it is explicit, and very hot, because it is not only smut but feelings as well, which is a great combo. But Natsu's brother was a big turn off (wtf) and the two neighbors were very annoying (the younger one, who looked like 12, was always or either spying on their sex life or asking to see when they were doing it... piss off, little boy!)