An Early Birthday Spanking

It's almost Andy's birthday and she's curious about what Chelsea might have gotten her. She finds a present in a shopping bag (carefully hidden) in Chelsea's closet. When Chelsea finds Andy trying on the new sweater, she's really upset. She really wanted to surprise Andy. So, now the only way to surprise Andy is to give her "surprise" birthday spanking that leaves Andy's bottom as colorful as the new sweater!