Young adult AU where Kara is a young delinquent who causes property damage at a local stable/riding school and once caught, is sentenced to serve her community service hours mucking out stalls and doing general handyman work around the grounds. In the process, she witnesses a riding instructor, Lena, teaching groups of young'uns how to ride and care for horses.
She's beautiful, that's what Kara notices first. But then she sees how good she is with the kids, even the rowdy ones who remind Kara of herself. Kara notices that all of the employees ride in their off hours, prepping for competitions or just to pass the time. All but Lena.
One day, the proprietor-- who Kara is friendly with despite the reason for Kara's presence-- notices Kara watching Lena. And when Kara asks for Lena's story, the stable owner gives it. Lena was once a champion rider, until a bad fall nearly left her paralyzed. Kara learns that Lena's beloved horse had also been injured, and couldn't be saved. Lena's been afraid to ride ever since.
Lena has met Kara at this point, and hasn't been rude, but they haven't gotten buddy buddy yet. Not until the stable owner suggests that Kara reach out to Lena for some one on one lessons, if Kara's interested. And despite being wary of horses in general (they're big, okay??), Kara is def interested in getting to know Lena better. Lena agrees to teach Kara, and in the process Kara convinces Lena to ride again, and then to compete with a new horse.
Along the way there's some forbidden romance (a Luthor cavorting with a delinquent?!), a close call with a tall jump and a jittery horse, and a well deserved blue ribbon. Maybe a kiss or two.