http://sta.sh/01i5dx8f836l the way I could see this work for that old rp, or a reboot of it would be gatomon left to "babysit" him when she has to leave the house. actually good idea for a reboot. grown up kari is a budding AB nanny, looking for an AB roommate, willing to be a full-time baby.
well, on the one with Jeanne, I was thinking he pulls his prank on Jeanne's mother. like, making her dance a jig right there. naturally, she wants to punish him, even if she wants to take him in even more due to his unusually strong magics..so she "remembers" that Jeanne really wanted to find a younger sibling, and delegates the role to Jacob as punishment.
as for the other one, we can have my character excuse himself to use the restroom, and fae discovers that he's diapered under his clothing, to get the meat of things started.