Sis Anastasia change messy cummy diaper

I'm going away for the weekend so I need to teach my bratty step-daughter Anastasia Rose some responsibility; she's going to babysit her ADULTbaby step-brother for the first time. She doesn't know anything so I need to teach her the basics like how to give him his sippy cup, how to do a diaper check and.... ohhh perfect timing, he needs to push out a big #2! Anastasia isn't being super cooperative so I have to coax her (aka. remind her who pays the bills here) as she rolls her eyes and does everything in the MOST dramatic fashion like most girls her age. SHe is HORRIFIED AND GROSSED OUT.  But first she needs to get all the cummies out into the diaper otherwise you'll be just rubbing your diaper all day. It's better for US to control when to make/not make stickies. She uses the wand over your diaper & you cum so fast! Then it's time to break out the wipes and she's SO GROSSED OUT, OMG!  I walk her through it calmly, step by step. Then it's new fresh diaper time and powder too! She survived the diaper change!   I ask her for halloween costume suggestions.