You've just finished school, chilling watching TV - having a great time. Until your annoying older step-Sister comes in and tells you that step-Mom and step-Dad are at work... and that she's in charge! She annoys you so much, you have no idea why all of your mates think she's hot!? Your big step-Sister makes you go to your room to do your homework... sex education. She walks in on you and starts teasing you, you feel so embarrassed yet start to get a weird tingling sensation downstairs. Something you've never felt before. Your big step-Sister feels so bad for teasing you, she offers to change you from a boy into a man. After all, that's what step-Sisters are for right? You know this is wrong, so why does it feel so good? Your own step-Sister deepthroating your penis until you start to feel a tingley sensation... and this weird liquid comes out of it.