Dropping aphrodisiac into Ena Satsuki's sister's drinking water

A guy fell in love with an older sister whose younger sister was Ena Satsuki. He often goes to his girlfriend's house to visit his beautiful single sister, Ena. While his sister was away and only Ena was at home, he came to visit and did not forget to bring a bottle of aphrodisiac and then dripped it into her sister Ena's drinking water. After a while of drug treatment, Ena's pussy started to leak and she craved sex more than ever. The opportunity came to this guy, and so he fucked her all day and gloated in pleasure.