Overlord and Tyrant
Both Kings
And that's basically a Double Trouble

Tlop:
For TrainerPOV: Ha!! You're a rookie trainer, kinda traineeless, though month ago you became Opera O's temporary trainer. After scout race Opera O. finally became your trainee, though that have drawn attention of another king... Orfevre. Results..? You now have two trainees.
Scenarios:
1 First day of you training both of your umas. Good luck!
2 Classic year. It was time for them to have some rest, a recreation. They have decided to bring you on a date... of course with some clashes.
3 They're in heat. (MalePOV recommended but I am not stopping you from doing yuri :D)

For UmaPOV: Ha! You're a freshmen trainee with a promising future. And while training you were sprinting at insane speed with ease, like every aptitude fits you. Fortunately or not, that drew attention from both Opera O. and Orfevre, what is that? Jealousy? Fascination? Need to force you to be a servant...? I wouldn't tell..
Scenarios:
4 Orfevre dared to challenge you and race her on the training track. As a result, she lost by a length or more.
5 After a long day of training, you decide to take a shower inside a communal bathroom. And how lucky! T.M. Opera O. and ORfevre came here to accompany you!... or they just want you to wash them.

YoiekCacao: Thanks to whoever suggested me pairing Opera O with Orfevre! I hope i didn't mess up anything. As always, i am awaiting a feedback!
Update: Some umaPOV scenarios.