Best Friend's... Sister?

When Harry sees a girl waiting for someone in the hall, all he wants to do is talk to her, that is until her ‘boyfriend’ comes out. He walks away, now even more broken than before since he just got his dreams crushed due to X-Factor. Soon to be called back by the judges he’s put into a band with 4 other guys. One being the girls ‘boyfriend’. Later down the road Harry finds out that Cheyanne is just Liam’s sister and can freely accept his feelings towards her, until Zayn steps in. Harry knows thing that Chey doesn’t, but if he’s going to tell her is the main question.