We Love Master!

Our protagonist is Yuuki Toshiya, a wealthy student. Gifted with good looks, excellent grades, and a kind demeanor, he is viewed as something of a white knight among the girls of his class - but that's only a front he puts up to the rest of the world...

The real Yuuki Toshiya is a perverted sex maniac: an insatiable lover of blow-jobs with both sadistic and masochistic sentiments, not to mention a cosplay fetish!

Three girls, Sakura, Kuu, and Hime, are forced to learn about this side of him. After Toshiya blackmails them into becoming his maids, they begin a daily regimen of sexual training!

When the girls learn about his audacious plan, they're furious.
"Pervert!"
"I'm not a pervert! I'm a super-pervert!"
And with that...
The days of conflict begin--between the girls made to serve their pervert master and the master training them to satisfy his sexual cravings!