You caught your step sister masturbating and for a long time you couldn't stop watching from behind the scenes while jerking off. She finally noticed you, but she didn't stay mad for long because her horny little step sister liked your perky cock. So she suggested we play together. First you had to promise that your parents wouldn't find out and then she took your stiff dick. She took it deep in her mouth and a moment later she stuck it out in front of you and asked you to fuck her properly!