Enjo Kouhai, also called by the less popular title Assisted Mating, is a five episode OVA released in 2020 and is supposed to air through 2022. Each episode is 16 minutes long. It’s source is a manga of the same name.
A special governmental program has been introduced to counteract the declining birth rates of demi-human races suffering due to a lack of male members. Through a so-called “assistance system,” randomly selected humans are required to mate with designated partners—be it elves, sirens, or even dragons.
Iris Thea Eaderlindt, an elven princess known for her open-mindedness and friendly attitude towards humans, is transferred to the Ark Metropolitan Academy. Coincidentally, her new teacher has been selected as her mating partner. Anxious yet determined to fulfill her duty of securing the future of her race, she starts partaking in sexual activities with him. To her surprise, Iris discovers that her partner’s ancestors were orcs, well known for their extraordinary sexual prowess.
As more demi-human students join the class and find out about their teacher’s “side job,” it becomes increasingly difficult for Iris to keep her partner’s attention solely on her.
The story for Enjo Kouhai is the only thing not on point with the rest but everything makes sense in the end after you watch all 4 episodes. As the Story Progresses you get start to understand how the World works and why she suddenly chose the the teacher which shows a lot of resemblance to the the MC of Interview with Monster Girls.
This is basically the same but they want sex to produce offspring to save their race. They start falling for him other than wanting his dick. Each character is unique and adds to the overall hentai.