Your little step sister catches you wanking off in her room, shes shocked but asks to see your penis, she says you cant be seen leaving her room with a boner so you will have to get him off, by mutually masturbating together. She tells you she'll instruct you how to jerk off so you dont cum before her. She strips off, teasing you asking what in particular turns you on about your little step-sister, guiding you how to stroke your cock and dirty talks to you, she plays with her pussy and tells you how your big cock turns her on, dont you wish you could fuck your step sisters tight pussy? She shows off her ass and instructs you to jerk fast as she bounces her ass. She goes back to masturbating and tells you to cum when she cums