I'm searching for a hentai movie which I saw many years ago on tv, though I cant remember much details. It was about two women, one of them merely a girl, which are some kind of undercover agents or something like that, in one scene they have lesbian sex. In the later part of the film they are captured on a big boat and have much sex there, in the first scene in this location the older one is tied to a bed and gets nailed by the boss of the criminals, after a while she begins to enjoy it and even looses her ties in excitement. Later she is there for weeks and has permament sex, is nude most of the time etc., her younger companion has sex with two blonde girls. Cant remember the ending, anyone knows which film this is? Thanks.