TEND-012 My Cheeky Stepsister is the Class President... Erisa Katsuki

One day, his parents remarried and he suddenly found himself with a cute step-sister. He was worried about how to treat her. Despite his worries, his sister, Erisa, brazenly pries into his private life. Yes, Erisa is interested in him as a man! Erisa uses her immature body as a weapon to get close to him, and there is nothing he can do about it...