Ryuudouji Shimon no Inbou Episode 1

A school secretly trains its students to be sex slaves who are then sold to the highest bidder. Ryuu, a male teacher, is entrusted with training the students. The head mistress, Sayaka, promises him a reward at the end if he does a good job. Spoiler alert:

Satsuki, quiet and shy nurse of Ishikawa General Hospital, only wants to make a good impression, but she keeps screwing everything up. When she accidentally gives an aching patient the wrong medication, he cons her into releasing his pain with a healthy dos

The story centers on Mizutani Masayuki, an ordinary high school boy. His classmate Shimizu Sayaka lives in his home as a zealously intrusive maid, leading to uncomfortably erotic situations.