Kick the hippocampus in the face

You bring your free leg down and stomp hard on the creature's face. He releases your leg and rears back, his fore-hooves slashing as he squeals in anger, his tail thrashing and churning the water to foam.

"You'll be sorry you did that, human!" he shouts, and he lunges at you, his cold, scaly body slamming against yours, sending you spinning through the water. You bounce off the wall, hard enough to leave you stunned. You give your head a shake and look around the dark, murky water. You don't see him.

A shadow passes overhead and you look up. He swims at you from above, slamming you to the stone floor of the tunnel and pinning you down with his muscular tail.

"Let me go!" you shout, your voice muffled by the water. You try to push him away, but he's too strong.

"I'll give you one chance to apologize," the hippocampus says.

"All right, I'm sorry," you say.

"Not good enough!" he snaps. "Show me how sorry you are. Suck my cock."

"Fish don't have cocks!"

"Lucky for you, that part of me is all horse," he says with a wide smile.