START-255 _Give the obnoxious sister an aphrodisiac to take revenge

After Yuta's father lost his job, Rei's older sister's income became the family's source of income. From that moment on, Rei was like a "Queen" in the house, all the others were servants, parasites clinging to her. One day, because the company went bankrupt, a friend of Yuta's who he hadn't seen for a long time came to send some things to his house. He said this was a vitamin so Yuta didn't doubt it much. Feeling a bit tired lately, Yuta tried some of his friend's vitamins and unexpectedly, his cock immediately became erect! Knowing that this medicine is extremely shady, Yuta decides to use it to take revenge on his obnoxious sister!