Black Kenkyuu no Oni Kyoukan ga Do M Onna da to Hanmei Shita node.

"I won't stop drilling you until you show me your O-face." When Kenta gives his harsh instructor some sexy payback, he gets to see her submissive side.
(Source: Coolmic)
Note: Simultaneously released in long-strip and traditional formats, with 18 episodes and 6 chapters respectively.