Imouto Twins  

Sex Exchange (2), 義妹×2[いもうとツインズ], 義妹×2 いもうとツインズ

One day, while studying in her room, Kokone's twin sister, Izuru, arrived home and went straight to their older brothers room. There, they began making love to each other. As twins, Kokone and Izuru could feel the same emotions of pleasure and pain. Overwhelmed by the waves of pleasure, Kokone started fingering herself until both rooms resonated with the sounds of their orgasms. This made Kokone angry, so she decided to take her brother away from Izuru.