You and your step sister are in college, so why does your step-mom Brandon still need to make you wear diapers on the road trip to the theme parks?? Your step sister teases you about still needing "protection" as an adult; she's SO MEAN. Brandon asks her to help diaper check you & she protests for a bit but does it. It smells like you sharted yourself & your step sister confirms that. They know it won't be long until you have a brown accident in your nappy... argh! Your step-sister is freaking out. "can you hold it?" You already soaked the front of it and your step sister has to check it with her hands; she's not happy at all. You can't hold the backside and mess yourself loudly.  Your step sis-Diaperperv can't even roll down the window cuz it's raining. Brandon has to pull over at a rest stop and give you a car change & makes your stepsis help out despite her being super grossed out. She pulls out a PINK wand vibrator and makes you cum in your diaper FIRST!

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