Searching yaoi manga

Hi I'm looking for a manga where the Yakuza kidnap the son of a politician, and they give it to care for a boy (which is not as yakuza but was cared for by the boss and now so is with them but it is a fool for stuff), and the two and are locked in a room and the son of politician starts interested in guy who cares him and things happen ... I think it's a little known oneshot; almost everything happened in that room and the drawing was not as stylized ... I want to re-read, hopefully you can help me.