Honoo no Haramase TenkouseiT-Rex
The main character, Tatsuya Tagami, has an ambition of World Conquest, and the first step of his plan is to make every female classmate pregnant. Unfortunately, his dream is rather impossible in his all-boys school. Hence, he transfers himself to the newly reorganized Hakuka Co-Ed Academy, which was previously an all-girls school.
Twins Izuru and Kokone harbor a deep love for their elder brother, but only Izuru has acted upon her feelings so far. When she arrives home from school, Izuru often goes directly to her brother's side and indulges in him. Unlike her proactive sister, Kokone merely watches them from the side while drowning in jealousy. All she can do is pleasure herself to the sound of their salacious acts.
One day, however, Kokone's frustration bubbles up, leading her to lash out at her sister and brother. Now, Izuru takes it upon herself to console Kokone, trying to convince her to be more honest about her feelings.
[Written by MAL Rewrite]
Tokumu Sousakan Rei & FukoAnime Antenna Iinkai
Based on the game series by Black-Lilith.