This idea turned more into a short store but like part 1 so please comment to say you wan't this idea.  thank you!!!!!

Sorry for the long long wait but i'm back again with more ideas.

Just picture them all horses not centaurs. But Allura and Coran are humans. Also Pidge can be a human as well if you wan't.

Keith and Shiro are wild horses but when the two are messing around in the field.

All of a sudden they both started hearing hoof steps.Then ropes started to be thrown at them. Now Shiro has been with people before but Keith has always been wild he was alone until Shiro found him.  Anyway they both start to run away until Shiro was caught Keith started freaking  out and started panicking when ropes were around him. They go back to the barn stable like place with the two new horses. 

When Allura starts training Keith. She first puts Keith tied to a pull to calm him down and two let hem blow of energy. But Keith just struggles for hours on end. So when Allura comes back with Shiro she asked " Coran how long has Keith been struggling for." Coran says "all day he hasn't stop'ed yet."  "Coran take Shiro for me." Allura says. When Coran leaves with Shiro Allura gets Lance tacked up. Allura takes Lance to the the fencing of where Keith is. Allura enters the arena and slowly starts to walk towards Keith. 

Keith freezes when he see's Allura. I'm running out of ideas for the first part so basically for the rest of the storie Keith takes a very long time to train Keith. Also in this au horses can talk to people that's how Allura new Keith's name Shiro told her. 

Whoever wants this book can make the rest of the store just comment to tell me you wan't this idea.