Somewhere in ancient Rome...

The whip smacked down on on the lion's chest and the sound echoed in the chambers under the colosseum. It was followed by a short growl. The light was dim down here. There was dust and the smell of blood, sweat and leather all around. Zake, a large, muscular otter and first of the gladiator's instructors, stood right behind the lion. He slowly pushed his hips back and forth.
"Lift them up, slave! You hold them too low again!" the otter yelled and gave the lion a painful smack over his large, firm balls. Maz, that was his former name before he became a slave, let out something between a growl and a hiss. "Yes master Zake, yes yes, grrrr".
He was sweating and with his last power he pushed up the weight stones over his head. They must've been doing this for hours now... He would not last much longer. Just as he contracted every muscle in his body and held the stones up with trembling arms, Zake pushed his huge cock balls-deep into the lion's ass.
Well that triggered something. Suddenly he felt wet all over, his breath stopped and his back arched. He was cumming so hard that the squirts hit him on his nose and chest, large streaks of cum all over his fur and in his hair.
Zake was biting his teeth together. He focused and resisted the urge to hammer his tool deep into this tight fresh slave butt. They would continue. For hours. This one had so much to learn... but he was destined to be his best gladiator ever.