Becky and Susie are hanging out playing Mario Kart. Susie starts teasing Becky, asking her if she’s wet her diaper. Becky counters back that she’s not wearing one, nor does she need to. That it’s totally Susie’s fault she wet herself. Becky then reminds Susie that payback is a bitch.
As they play, Becky decides they should make a bet on the game. If Becky wins the next round, Susie would have to wear a diaper. Susie reluctantly agrees and the two play their round of Mario Kart. After a few intense minutes, Becky is ultimately the victor. That means Susie is going to be diapered. Even if she has to be dragged kicking and screaming.