My stepmother's daughter, who came to live with us after my father remarried, is a girl from my class who is known as the cutest girl in school. I'm now living under the same roof with a girl who I could only look at until now! In fact, we're sharing a room! My room is becoming more and more girly every day, and my space is becoming extremely cramped... Furthermore, thanks to my suddenly acquired stepsister's wide circle of friends, a bunch of cool girls are coming to hang out! At first I didn't like her because she was noisy, but now I can see her panties as much as I want, and sometimes she's even more erotic than that...