Using aphrodisiacs with a lower class female student

A big brother at school learned that among the new students who had just entered the school, there was a very beautiful and cute girl, Eimi Fukada. So he and his group came to invite Fukada to his house to play, as an introduction, otherwise it would be difficult to stay at this school, so Fukada had to agree. But who would have thought that ugly, fat enemy boss put aphrodisiacs in the water and invited Fukada to drink it, you all understand the ending.