I'm looking for a very specific manga. I read a very long time ago and would like to continue reading it. It's about two brothers. One is a doctor and is into BDSM. The other is a high-school student, if I remember correctly. The older brother is taking care of the younger. If I'm not wrong, he got into BDSM after seeing his parents do it, and repeated it on his younger brother. The manga is pretty hardcore.
