Based on the hentai game by Tinker Bell. Shio Atsushi is a professor who will provide home class to two daughters of different families: Arisa and Maya. But it seems this won’t be only educational purpose since the two girls show interest to that man.

When Mina agrees to come as a last-minute invitee to a mixer, she is surprised to see her brother sitting across the table. However, she decides to bite her tongue and not reveal this to her peers—even when the king’s game that they are playing starts to get increasingly sexual. Elsewhere, the nature of Sayaka and her brother’s relationship changes when her brother discovers a hole at waist-level in the wall between their rooms. Will Sayaka notice her brother watching her most intimate moments? [Written by MAL Rewrite]

Imaizumi is a young regular highschooler, but somehow his house ended up as a hangout place for 3 girls from his school. The story starts off when the girls are playing a game in Imaizumi’s room, while one of the girls is hugging him from behind as they play. The other girls get thirsty and decide to go to the grocery store to buy some snacks, leaving him and the blonde girl at the house. That’s when the blondie takes action. After their arrival from the store, they see the boy and the girl doing it. The girls can’t help but notice how exquisite his “thing” is and naturally they start playing a different kind of game.

Based on the game by Lune.

High school student Hiroki is a perfectly average guy, except for one thing: his insatiable fetish for glasses. Due to this fixation, Hiroki rarely goes a day without engaging in sexual activities with his girlfriend, the gorgeous, glasses-clad Hitomi Kurumizawa, in his home. One day, however, he is caught in the act by his older sister, Natsume—a bespectacled beauty—who decides to “punish” him for the noise caused by his escapades. [Written by MAL Rewrite]

A guy by the name of Kuroda-sensei is given a job as the new coach/adviser of the girls lacrosse club in a all female school called Felinus Academy for Girls but… it turns out to be a bumpy ride as he encounters sex fiends among the squad, and his adventures begins as he attempts to gain their respect as adviser. (Source: MU)

This story about a married woman, as is usual in such stories sexually unsatisfied in married life, and decided to make up for lost time with her brother, who came to stay with her husband and children. What started as a harmless joke on a drunken bench, will grow into a constant frenzied sex always and everywhere, at any convenient opportunity.