I share a room with my little sister, a slutty high school student, in a small house. She brings her friend (who's also a slut, naturally), and they're talking about slutty things that are pretty extreme for me, a high school student. Even though I don't want to listen, I can't help but overhear them, and my heart is beating fast. My sister's friend, who's been watching me behaving suspiciously, takes advantage of the opportunity when my sister isn't around...