It was only about 2 hours after his sister had finished eating when she started to feel pressure in her bowels.
Jeff had been through torture, constantly hearing the sounds of his sister digesting her food, and the movement of his sister playing. She was now in her crib, probably mere moments away from a nap when he feels her shift position. He ends up getting pushed closer to her anus which, to his horror begins twitching.
"Oh no! Please Nina please hold it, i'm your brother!" he cries out, however Nina grunts as she focuses on pushing out her waste. A smile going across her face as she feels the relief that she has started using her diaper, an act of unintentional cruelness.
Her anus opens up and a gust of foul air hits Jeff, if he could gag he would, but then he sees it; a brown soft mass on the other side. He only sees it for a split second before it closes up, but Jeff knows he just saw his end. Soon it begins to be pushed out, the shit quickly landing on Jeff's face, erasing him instantly and turning him into nothing more than a diaper being messed in.
Nina sighs in relief as she feels good as she empties her bowels. After a minute her diaper is much bigger than it was before. She begins crying out to be changed