Isekai Harem Monogatari

Naoki Oikawa was busily fapping away to his naughty porn mags when he was suddenly transported to a fantasy world filled with demon lords, monsters, and… sexy babes? Join the ostensible MC-turned-hero as he helps his comrades defeat the demon lord by using the power of his own semen! (Source: Fakku!)

Dropout

In a school foundation there are creating new ways of learning to improve student achievement. That is for those who get a small score and fail the exam will be in the Drop Out (DO) and made sex slaves for impingement lust. And for those who get high achievement will be served free sex in a special lesson.

Fella Pure: Mitarashi-san Chi no Jijou - THE ANIMATION

Everyone sees the student council president Mitarai Keiko as the perfect girl, but what they don’t know is that her favorite thing in the world is performing fellatio on her younger brother Noboru. With their parents always traveling, they fulfill this desire quite often and in rather adventurous ways.. (Source: Nekopoi and Has Been Translated and Edited)

Hinagiku Virgin Lost Club e Youkoso ♡

At first glance she looks like a plain Jane, but Hinagiku Kuroko is actually hot and sexy as hell. She has feelings for Otonashi Suguru, who works at the library with her, but he has feelings for the idol of the school, Moegi. In a string of events, Kuroko ends up confessing to him while he's blindfolded, but her voice is similar to Moegi's. From that day on, she rapes Suguru everyday while pretending to be Moegi.