It's been quite a while since I saw the manga so please don't get mad if my description of
the story and the actual events don't correspond with one another.
Alright so there was a lady that wanted to workout/ get fit for her man i believe that was over seas.
She went to a personal trainer and of course he offered to help "with his own intentions :P" He gave her
massages everyday... rubbing all over her body for the past week telling her that it was
to help her loosen up, and also letting her know when she gets home she can't masturbate.
One day she came back to the Trainer and snapped. "her switch was flipped" and she wanted
the Trainer and all that he could give her. "wink, wink