Sensei Nante Kirai Desu.

From Shinmakoku Scanlations : One day Ikuta Aoi made his crush mad when he tried to confess. However, he was forced to open up to his Social Studies teacher, Shizu, and when he finds out that his crush likes Shizu he is brokenhearted. He decides to properly confess to her and, thanks to Shizu’s backing, Aoi is able to, and he reluctantly apologizes to Shizu for being rude to him. Even though things should be over, he is forced to be Shizu’s servant as punishment.