Meanwhile, over at the hamburger shop, kinky doings are transpiring. The manager likes to administer sexy punishments when his female clerks break the rules. Eventually, Masaru is invited to the party and finds a family affair waiting for him... 
(Source: AniDB)

As night arrives the shadows of Koga fall on Iga and a new threat exists for our lusty vixens. After a torid sexual encounter Yatsurugi Shinobu's best friend Mashiba Aya is infected with a parasitic bug and succumbs to its will. Having the same insatiable urges, the same tragedy is about to happen to Kage Lena. The only known antidote is stored deep within the labs of the Koga Institute and is the only thing which will save Kage Lena. (Source: AniDB.net)

Based on the eroge visual novel Harukoi Otome ~En de Gokigenyou~ by BaseSon. 
 
Harukoi Otome revolves around protagonist Akihito Hayasaka, a male high-school sophomore. The high school he attends St. Francesca Academy used to be an all-girls school, and still has a high percentage of female students. Akihito's younger sister (Umi Hayasaka) and his childhood friend (Yuika Serizawa) are also students there. Akihito meets many girls there, and becomes friends with them. 
 
(Source: Visual Novel Database)

Based on the erotic game by Candy Soft. 
 
My name is Kuya Hiiragi. Actually, I have six elder sisters. The eldest sister is Hinano Ne-san although she looks quite young. She is always worrying about that, so if she is treated like a child, she gets angry. The second sister is Kaname Onee-sama. She is a popular lawyer and is known as the "Icy Lawyer". In fact, she is my first love. The third is Serori Ne-Ne. She is half Japanese and half North European. She has the most voluptuous body of all the sisters, but her behavior is very childish. The fourth is Tomoe Ne. Although she looks quite stern, she is actually quite gentle and gets teased by the other sisters. The fifth is Takane Aneki. She is highhanded, and treats me like a servant. She often beats me. The youngest sister is Umi Oneechan. She takes care of me a lot, and devotes much love to me. 
When I was a child, I was adopted by the Hiiragi family. But because the father was afraid that the sisters would spoil me, I was sent to a relative to train myself. It is the first time I`ve gone home since then. I was very excited to see them again, especially Kaname, my first love. 
They welcomed me home, but late at night, Kaname Onee-sama raped me, and treated me like a toy. I felt very ashamed and I made up my mind to train my sex technique to put her to shame...with the help of the other sisters. 
(Source: AnimeNfo)

From the authors of Bible Black and Discipline comes this new OVA based on a game with the same name. 
When their father is given a transfer, Todo Yuto and Todo Erika are left alone. They are siblings, but they are not blood related. When Yuto was a child, his mother died. His father remarried a woman who, herself, had a child from a previous relationship, Erika. His stepmother was quite gentle, but she, too, has since passed away. Living alone, they begin to love each other as a man and a woman. However, an art teacher, Sayaka, notices their relationship and... 
(Source: AnimeNfo)

A super-secret cult of lesbians performs erotic experiments on bodies from the local hospital. Their purpose: to revive the spirit of their ancient leader in a virile human form. Now it`s up to the Midnight Strike Force, a team of busty justice fighters, to go under-cover (and under the covers) to stop the nefarious acolytes before they succeed in their diabolically dirty schemes.
 
(Source: Anime News Network)

Based on the erotic games by Soft Circle Courreges. 
 
Going through life is hard enough for a coed at her sexual peak in an academy full of horny boys, but it's even harder when she's got horny boy parts of her own. Miss Futaba finds it hard to sit quietly in class when something down there keeps her too distracted to think straight. Day in and day out, she's waiting for the classes to end so she can run off and relieve her pent-up desires. When a few others find out about her secret, her sex life explodes into new heights as every possibility is put into practice.

The story revolves around Takuro Hayami who transferred to the mostly female Saint Arcadia School. Seemingly all of the girls want to have sex with him because the school only recently started admitting male students. Takuro seems like a normal student, but what the girls later realize when they try to take advantage of him is that he has a secret. Takuro has an "Ultimate Sex Power" that becomes the focus of St. Arcadia's sexual power struggle.

Sora was lying in front of a hospital. He was seriously injured, and when he was about to die, a nurse, Yagami Yu, helped him. 
He was sent into an emergency ward, and he met a beautiful woman, Mikage Reika. She was a director of the hospital, and she asked him to become a test subject. Because he didn't have any relatives, he accepted it. Then, Yagami Yu was supposed to take care of him. 
Since that day, his fate had changed a lot. 
(Source: AnimeNfo)

An elite doctor Kuwahara couldnt forget his thought toward Nanase Ren, whom he had loved in his youth. Then he changed the hospital to work one after another to look for her, and finally he met her again at the St. Cattleya Hospital. However, her attitude was remote and his love couldnt be fulfilled. To make the matter worse, he received photograph on which Ren was molested. Ren had been turned into a lewd woman by Hirasaka by the woman body experiment when she was at the St. Julianna Hospital. He was disappointed and he lost his mind. Kazama Mana who was a nurse of the gynecology and obstetrics section, loved Kuwahara, and she resembled Ren. Taking advantage of her thoughts, Kuwahara raped her and deprived her virginity shouting the name of Ren. 
(Source: AnimeNfo)

D3