Reverse!(2004)

Amemiya is a teacher who is now teaching at an all-boys school. Frustrated with his currently situation on career and love, he decides to mess up with what seemed to be a gay couple, just so he can "relieve the stress". The sweet Mifune and the whiny Kishima aren't what they seem to be, though, and it doesn't take long for Anemiya to discover that. Now, because of fooling around, he got himself in serious trouble...