Dominic's best friend is his little sister. If they woke up having switched bodies, he would be very confused and concerned, but try to calm her down because she would definitely be way more scared. Then they would hang tight and not do basically anything but try to figure out how it happened and how they could get back into their own bodies.
If pressed to do something, Dominic would manage just fine at Cocoa's college for a day and she wouldn't do too badly working at the convenience store. They would probably go to Honey for help expecting that somehow she would know how to fix things, and somehow she actually would.