Step-Mommy gets an email from your school, your grades are back, but they're not what she was expecting. You're usually a Grade A student, but suddenly you've started to fail your classes. Step-Mommy tries to talk to you, and eventually you tell her all about the girl you have a crush on in your class, you get distracted by her, but she will never go for you, she's kissed a lot of boys, but you don't have any experience.
Step-Mommy is shocked, and hurt that you're interested in another girl other than Step-mommy, she sounds like a slut, kissing all those boys! You don't need her. But you tell her how sad you feel, and Step-mommy decides that the only way for you to get kissing practice, is by using Step-mommy. You can use Step-mommy's big fat lips to kiss, and Step-mommy tells you how much girls love their asshole and pussy's kissed too, so you better practice on Step-mommy too. Don't worry about your cock twitching, if you need to stroke Step-son, then do it, you and Step-mommy can cum at the same time whilst you kiss step-mommy's holes.