Hikaru/Haruhi/Kaoru
The Twins: Part V
The Twins knew each other inside and out. Hikaru always knew what Kaoru was thinking and vice versa, which came in handy when one of the twins became uncertain of themselves. But Kaoru was undoubtedly the more perceptive of the two. So naturally he realized Hikaru's feeling for Haruhi's first.
Kaoru wondered if Haruhi would be willing to settle for either of them, like so many girls in the past. If she was, they couldn't accept her. They were different people, all appearances aside.
Hikaru wondered what was it about this girl that he found so interesting. Hikaru never found girls to be interesting. At least never for long. Yet Haruhi had his attention for far longer than anyone but his brother had ever managed.
She was fiery, yet quiet and meek. She had her own opinions and wasn't afraid to defend them. He really liked her. She wasn't like all the other shallow girls he entertained at the Host Club. While sometimes she was easily flustered, she blew off his attentions at the same time. She was well and truly fascinating.
Haruhi began genuinely liking the boys after they helped her out…. a lot. She couldn't exactly help it. Both were smart, good looking, interesting, what was there not to like? Hikaru had an interesting temper and was more impatient than his brother Kaoru. Kaoru was more observant than Hikaru. Both had their individual quirks than Haruhi liked.
The twins were impressed with Haruhi's ability to tell them apart. Impressed enough to start a fake fight over it, just to see how she reacted. Was it smart of them? No, but it was mighty fun not only to play fight with each other in that manner, but also to watch the Host Club members reactions. It was even funnier to see Haruhi's reaction to being tricked by them. It seemed she was genuinely worried for their relationship.
It was safe to say both the twins were interested in Haruhi and were willing to share her with each other. As long as she was willing to accept both of them that was, and not just one or the other uncaring of which.