Gooning for the Baddie Boss

The protagonist is lowest class foot soldier in an evil organization. Everyday, he gets beaten up by heroines of justice and bullied by his evil female boss Berith in hellish training. One day, when carrying his injured female boss to her room after losing the fight with justice heroines, he gets extremely horny from touching her plump and erotic body. When being scolded as usual, with the intense lust and daily accumulated frustration, he takes advantage of his weakened boss and rapes her in a fit of madness. After that, he is prepared to get shattered but somehow his boss's attitude to him changes in a big way!?