There is one particular thing that Mistress Ariel really hates and that is laughing at the wrong time in the wrong place. Her useless slave did that multiple times, maybe because he is nervous, every time he is close to his mistress, but he got so many punishments for that, Ariel can't even count them. Now she is whipping his bare back fully and she hears him laugh again, so she gets really really pissed.