She wets her diaper

Gradually Chloé began stepping up and down with her hands on the front of her diaper, trying to hold in her pee. "Ungh! Ungh!" She grunted as the feeling was building up. Of course Zoé was eating this up.

"It's okay baby sister, you don't have to hold it."

Chloé began to fume. "For the last time, I'm not a baby!" But just as she said that the front of her diaper became soaking wet, everything her poor bladder was holding just burst out and into the diaper. Thankfully, none of it spilled out, but the blonde fell to her knees, ashamed that she wet herself for the first time since she was five.

"Oh, my poor baby sister." Zoé cooed as tears rolled down Chloé's cheeks.