Peace Hame!

A 2nd Year High school student and a Kendo club member, Tamao Tsukamu, admires his senpai, the club captain, Kiritani Konome. One fateful day, she asks him for a favor involving making special kinds of photos for the student graduation album.

Sex Exchange (2)

Kokone was studying in her room one day when her twin sister, Izuru, returned home. Izuru immediately went to their elder brother's room and the two began to make love to each other. Being twins, Kokone and Izuru are able to share feelings of pain and pleasure. Thus, unable to resist the waves of pleasure, Kokone began fingering herself until both rooms simultaneously echoed with the twins' cries of orgasm. Annoyed at them, Kokone decides to steal their brother from Izuru. (Source: AniDB, translated and adapted from official site by Cranston)

Zettai Junshu☆Kyousei Kozukuri Kyokashou!!

In 20XX, the humans are about to go extinct... Since the ratio of men and women is now 1:10721, the authorities establish a new law, "Sex New Law", and issue a card called "Free Sex Licence". Once a man shows his card to a girl, he will be able to have sex with her soon. However, it doesn't work... The authorities decide to issue a new license to break the deadlock... (Source: ErogeShop)