My horse is a human

Katie is a regular sixteen year old girl with in older brother Dannie . There parents are never home but she is rich , she is not like other rich people with there fancy clothes and she is not stuck up . Katie is a loner in school always hiding in a corner reading . She does not ask for stuff all she ever asked for was a horse . But she has a secret her horse Jet is not just a horse , jet is a human , he can turn human when he wants . But is Lilly the only one with a secret . What if her faithful brother was keeping something from her