Considering all the creepy stalking, grooming, emotional manipulation and blackmail that goes on in these erotic manga, (not to mention the outright r*pe and p*do shit,) there's something almost pure and wholesome about straightforward prostitution between consenting adults. It even seems to be quite grounded and realistic, if heavily idealistic - no seamy underbelly here, or not that they've shown so far - which is nice. It manages to be quite sweet while still being very erotic, and keeps the reader engaged without getting bogged down in endless angst. Since I'm mainly interested in the romance side of things, the 'prostitution' tag almost made me skip this one, but I'm glad I gave it a shot.