How Could You Refuse?

While our parents were away, I had to spend a few days with my stepsister. The minute they were out the door, she called her best friend over, who is extremely pretty, but also a brat, like my stepsis. She is totally shameless, and constantly horny. She didn't care when I accidentally walked in on her in the shower, and wanted to suck me off, right there and then... The way she looked, this stunning fox, no way I was going to resist...