It really shouldn't have surprised them.
Teto Kasane Kamui was the best and worst little girl anyone ever had the chance to come across. With the voice and face of an angel and the scheming power and possessiveness of a devil through and through Teto was well suited to her birthday April 1st, April Fools Day. Of course, she would never plot anything big for her friends and family, just minor things like loosening the salt lid for Luka and replacing all Len's fresh bananas with old black ones. She never actually played a prank on Haku and Gakupo, "Momma" and "Papa". It's not that she loved them too much, because she loved all of her friends, it's simply because they never said anything mean to her or annoyed her.
Now Uncle Dell was his own category, he never said anything mean to her, but he never said anything to her, which annoyed her very much. Teto spent every day with Haku as much as possible but, when Haku was working with Miku in the recording studio or stopping by Dell's place to force him to go to sleep, Teto was in his house generally playing around. He was always too busy for her or asleep. Needless to say, Teto can get around Dell's house perfectly fine without his or Haku's help.
Teto got bored very quickly and just watching Uncle Dell sleep in his chair with his head hanging back was just too tempting for her to resist.
I wonder if Uncle Dell wears makeup? He's too bust to wear makeup. I wonder if he'd like it. Maybe he'd like to wear pretty colors on his eyes like Ms. Ann. (Sweet Ann) But Ms. Ann likes blue and Uncle Dell likes grey. So he can have grey.
Dell woke up and went to the bathroom at the urging of his bladder. He washed his hands and looked up into the mirror to see that he had poorly done makeup all over his face done in marker.
After the first time there was lots of yelling and on the way home Momma Haku said, "If he falls asleep again feel free to color on him. Just don't tell him I said that." Oh Boy! Momma's not mad! Yay! How fun! Uncle Dell's going to get it now! He he he.
Surely enough Uncle Dell did get it. And he got it again and again and again. The coloring wasn't the only thing Teto did. She raided his cabinets for sweet things, and threatened to pull the plug on his computer multiple times if he didn't get her some food. After a while Dell learned to stock up on French Bread. He gave her sheet music and told her to learn to sing. Dell even let her watch whatever she wanted as long as she wanted as long as the volume wasn't loud.
He gave her whatever he could to keep her off his back and succeeded for the most part. They just never got over that thing with the markers. Eventually Teto got a little older and got interested in music and went to the recording studio with Haku, saving Dell from so many hours of scrubbing his face clean. However by that time he had come to miss her little visits.
A while later although not quite what he expected, Teto launched a new project called Utau, which soon became a full fledged branch of Crypton. Dell never had the same level of peace again at work, but deep down he was happy.
"Not again! Teeetttooooooooooooo!!!!"
Really deep down.