All of a sudden, Rachel's sister, Chloe felt a pressure in her stomach. "Are you sure, Rachel?", asked Chloe? Before Rachel could answer, Chloe grunted and pushed a warm, sticky mess into Rachel. Rachel felt herself "expanding" to contain Chloe's mess. Rachel was in heaven. She could taste her sisters mess, and boy did it taste good. As Chloe was still pushing her mess out, she began peeing into Rachel. The new mixture caused Rachel to convulse in orgasm. Chloe then untaped her pull up and began massaging her pussy as Rachel's convulsions rubbed her clit. Chloe then began squirting into Rachel. After several orgasms, Chloe collapsed and sat back into her messy diaper. Rachel then said quietly, "I wish..."