The Reason - Ouran

Tamaki doesn't really get all the stuff about people saying he's in l’amour with Haruhi but he is bothered par it.
The Host go on a trip to a market and they all decide to compete to buy something for Haruhi. Whoever buys the thing she loves the most wins! (They're always doing stuff like this! lol)
Tamaki ends up buying her and him matching rings that is made to look like expensive tuna (the nourriture they're always teasing her about that she wants to try. lol)
Haruhi, having figured out that she does l’amour him, adores the ring. She laughs and thanks Tamaki. She excuses herself to go to the bathroom (or...

If you're lire this I know it's because your a fan of the OHSHC. Maybe you've read the Manga, if that's the case you'll know all this. If toi haven't read the manga then this will be very informative to you.
In the manga the story goes so much farther. I'll give the best details :)
Kaoru realizes that he, Hikaru, and Tamaki are all in l’amour with Haruhi. Haruhi was hanging out with Kasanoda (the dude with the red hair that knows Haruhi is a girl) and Hikaru gets really jealous. He tells Kaoru that he doesn't understand why it makes him so mad to see Haruhi with another guy. Kaoru smartly tells...

Alright! So, now I'll cover a little of Tamaki and Haruhi.
Tamaki starts to get feelings of desire to Kiss Haruhi and he doesn't understand why. (Duh! lol) He worries about it so much that he makes himself physically ill. This causing a lot of alarm to the household help since Tamaki has never been sick before.
The club members all decide to go and see him, which makes him really happy. (It's pretty funny in fact because the boys decide to help him change his PJ's into clean ones and they kind of forget that Haruhi is in the room so she sees Tamaki in his underwear, which horrifies him! lol)...