Tokyo Train Girls 2: Supervixen

Ayumi is married to Yukinari, a man with some serious sexual perversions. He enjoys molesting his wife on the train, engaging in some light bondage and blindfold sex sessions with her. He's also been sleeping with Kazuha (who happens to be Ayumi's friend) on the side. Eventually he even hires a man to rape his wife while he secretly records (and enjoys) the action. A lot of sexual manipulation ensues and at the end it's a twist to see who's been playing whom.