You and your 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 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 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 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 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!  You feel so helpless lying there in the backseat, brown mess on your bare bum, diaper open and Brandon nonchalantly wiping your bum... so embarrassing to be in this dilemma. Very good banter with your sweet, super sexy, doting AB-mom & mean sister balancing her out.