In school trip to the nudist beach!!

Take a school trip to Nude Beach where this beach has rules for all visitors to be naked without dressing, and also men are forbidden to be aroused. However, if someone is aroused then someone will be given the opportunity to release his desire by doing pervert things in the tent. (Source: Nekopoi and Has Been Translated and Edited)

LOVELY×CATION THE ANIMATION

Based on the erotic game by Hibiki Works. The protagonist lives alone in an apartment owned by his uncle and lives a carefree school life. One spring day, his uncle can’t stand seeing him confining himself in his room any more and tells him to go out and find love while he is still young. However, he doesn’t have any experience with girls nor does he have anyone that he’s interested in. (Source: Hau~ Omochikaeri!)

Sinful Sis

A sister named Honoka who likes her younger brother Hirokazu, that Honoka sees Hirokazu doing schoolwork with a woman named Akazaki, and she feels jealous. Then he ventured to declare his love and he really wanted a Sex Relationship with Hirokazu. But Akazaki heard a voice from the next room and he suspected Honoka was watching a porn scene. And the next scene is transformed into a sex between Honoka and Akazaki. (Source: Nekopoi and Has Been Translated and Edited)

Nee, Chanto Shiyou Yo!

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)