Somewhere Only We Know - Ch. 1

The Host Club king, Tamaki Suoh decided to mix things up for his beloved club that they must do a challenge under his directions. His challenge was called "Serenade Song".
The challenge was one member of the club had to choose someone else either in the club or out of and sing a song dedicated to them. Tamaki will do one to Haruhi, expressing his love. Mori will do one to Honey, expressing their friendship and Kaoru.... doesn't know WHERE Hikaru is.
The day the challenge was brought up to the club, Hikaru seemed right on board and had already expressed to the club and his twin HE would be the one to sing the song. He saw this a chance to show the club members the twins love that had expanded from brotherly love to full fledged romance. Though Kaoru doesn't want anyone to know yet, it would be too weird he guesses.
So since then, Kaoru had waited for Hikaru to at least hint at what the song was but he hasn't. In fact, Hikaru has completely DISAPPEARED from Kaoru's sight for the few days he had been practicing. Kaoru has been looking for him and even when he finds him(with help and aid from Kyoya) he still is left clueless to what the song is or about or what is up his tricky, troublemaker twin's sleeve.
Kaoru guesses he must just wait until the performance day. Hikaru refuses to tell his twin but definitely has something important and special for him.