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Ally is in bed, innocently napping away most of the day when her little, bratty step-sister comes in and rips the covers off. Ally is home from college on break so her little step-sister wants to get as much time in as possible. Today, she really wants to go check out the newest movie. Ally, however, just wants to rest. She's been stressing over classes and just wants to escape all her problems.

Susie however keeps bugging her to get up. Ally finally gives up and agrees to go the movies with her little step-sister. Susie stands there, waiting. ...

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Ally is in bed, innocently napping away most of the day when her little, bratty step-sister comes in and rips the covers off. Ally is home from college on break so her little step-sister wants to get as much time in as possible. Today, she really wants to go check out the newest movie. Ally, however, just wants to rest. She's been stressing over classes and just wants to escape all her problems.

Susie however keeps bugging her to get up. Ally finally gives up and agrees to go the movies with her little step-sister. Susie stands there, waiting. To help motivate her Susie even starts picking out some clothes for her older step-sister. Ally keeps begging her step-sister to leave so she can change, but Susie won't relent. Susie retorts that she's seen her older step-sister naked millions of times, so right now is no different. She doesn't want to miss the start of the movie, and is afraid if she leaves her step-sister will just go back to bed.

After some nasty remarks, Susie finally leaves the room to let her step-sister change. But you don't earn the title of the annoying little step-sister by always letting your big step-sister be. Just as Ally pulls down her pants, exposing her wet diaper, Susie comes barging back in. Ally panics, trying her best to hide and deny that she's standing there in a wet diaper. Worse, that she's wet because she's been having bed wetting issues.

Her little step-sister is having a blast finding out her big step-sister wears diapers and won't stop teasing her about it. Finally, Ally admits that she's been having wetting issues because of how stressed out at school she is. So their step-mom suggested she wear diapers again, since that's better than wetting the bed and having to clean up that mess every morning, not to mention trying to do that in a school dorm.

Finally Susie lets up and lets her step-sister change out of her wet diaper. With that, they head off to the movies.

Later that day, Ally is getting ready for bed. Susie comes barging in, demanding to help her big step-sister put her diaper on. Ally refuses, saying she can do it herself and doesn't need her bratty little step-sister putting a diaper on her. Susie then asks why step-mom doesn't know she's wearing a diaper. Susie decided to ask their step-mom if Ally had talked to her about any problems at college, because one day she'll be going too.

Ally is stunned. She doesn't really have a come back since she didn't think her little step-sister would actually ask. Susie then threatens to tell step-mom if Ally doesn't let her put a diaper on her. After all, it's practically the perfect revenge. Years of Ally diapering her, and now she gets to diaper her big step-sister so she doesn't wet the bed.

Not having anything on her little step-sister, Ally tells her where she's keeping the diapers. Susie gleefully grabs one, unfolds the crinkly diaper and has her step-sister lay down. Just before pulling up the diaper between her legs, Ally reminds her she needs to be cleaned up a little first. Susie can't help but comment just how much of a baby her big step-sister is. Once diapered, Susie also finds Ally's binky! Susie plops it in Ally's mouth, tucks her big step-sister into bed, kisses her on the forehead and heads to her room to go to rest herself.