I don't like this one as much as the sequel. It isn't as careful and psychological. This one is more self-indulgent, I think, and I find it odd that the teacher would be so careless as to risk this sort of thing getting out when he'd carefully groomed the first boy over a period of time. It's an interesting concept, the process of breaking in a plaything, and the prequel was disturbing and sad, but very well done. This was... okay. It had a slight edge to it, but it ultimately felt more like typical yaoi BDSM than Harada's work usually does. Though that thing with the toy and the classroom is definitely screwed up. I've never seen that used in such a dark way.
Kyoushitsu no Yugami