You are a fly on the wall in a steamy bathroom. step-Brother is taking a shower, when sis comes over after a terrible day. Her boyfriend broke up with her, and step-dad made her feel horrible about herself when she tried to talk to him. But the siblings talk and laugh-- they are obviously close. He starts to make her feel better, and tells her how beautiful she is-- if she were anybody but his step-sister, he'd go for her in a second. It's been too long since she's had sex, and she's getting really horny. As the room heats up, she strips down, beginning to masturbate just on the other side of the shower curtain. And she knows what she wants when he steps out-- she wants to be fucked, used, and she wants to cum. She'll do whatever she can to make that happen. It's not like they haven't gotten naughty together before...