Tsuma Netori Kan: Bijutsu Kyoushi no Baai Episode 1

Yurina Suzukaze is a young lady teacher who is extremely popular with the male students at the school. But she falls into the trap of her colleague, Sakakura, who has an unusual liking for her, and for half a month, she is confined to a training room in the basement of the school, where she is trained as a meat slave.