"O.k," you say. "Madison go help her," you order her pointing towards her sister.
The little cutie smiles and gladly goes to help her sister. At first Amber is against letting her little sister wipe her bum, but you convince her; and without even using magic.
Madison quickly goes about the tasks of taking off her sisters diaper, wipeing her bum, powdering her little tushy and rediapering her. She starts out doing a very wonderful job. She's very maternal with her sister, calmly untaping the straps of her diaper. When she uses those wet wipes her mother got at the stores he gets every nook and cranny. She sister spotless and her sister for her own part stays out of Madison's way.
This efficiency is very boring. You decide you should spice things up. As Madison is finishing wiping up the last of the crap in her sisters crack, you dream up a few ways you could make things more entertaining.
A couple of fun ideas come to mind, but you decide to...