Derek's punishment for putting his sister in her bikini is he has to touch her legs.
Derek: Hi, I'm Derek Crystal and I will put my sister, Kumi in her bikini.
Kumi: Hi Derek. What's up?
Kumi: What are you doing?
Derek: I'm putting you into your bikini.
Derek: Yes! I put Kumi in her bikini!
Kumi: Oh oh oh oh oh oh oh oh oh oh oh! Derek Crystal, how dare you put me in my bikini! You know I'm not going swimming! That's it! You are grounded until Halloween!
Kumi: Now you will start touching my legs and you will not stop until you're ungrounded on Halloween 2015!
Derek: Wa wa wa wa wa wa wa wa wa!
Kumi: Waaaaaaaaaaaaaaaaaaaaaaaaa! Oh shut up Derek! This is what you get for putting me in my bikini!