Lizzie knows you perv out to her, so she wants to get through the sexual tension right here and now. She is your step sister and you have had nasty thoughts about her, but you never thought that she would want to help you jerk yourself off! You take her direction well and each time she calls you "a good boy" it makes your dick throb. Her sweet voice would be enough to make you cum, but she has raised the stakes by taking off her bra. Those beautiful titties motivate you to keep jerking. You did not know her belly button was pierced, but now you can see it. Then she takes off her skirt and panties. She is totally nude and touching her pussy as you stroke your dick. This girl is a supreme cock tease, but she is sort of sweet about it. Before you know it, you have blown your load and you look forward to your next encounter with your big step-sister.