Give in and beg for mercy

"All right, you win," you say. "Let me go and I'll have fun with you."

"Sorry, you had your chance to play nice," Tide says. "Now I'm going to have fun with you."

The water gripping your arms begins to pull you forward, bending you over, and your heart starts to pound as you are maneuvered into position. Tide flukes up behind you and teases the crack of your ass with one slippery flipper, rubbing up and down over your tight hole. He giggles, and you glance over your shoulder as he ducks below the water and presses his face between your cheeks, driving a startled gasp from your throat as he licks your entrance, his wicked tongue doing unexpected things to your body. Your cock hardens almost instantly and you can feel you balls begin to swell.

After a moment, he draws back, leaving you out of breath and confused. Sure, it felt pretty good, but you've never gotten a hard-on that quickly before. Do you have a secret ****-fantasy fetish you never knew about? You hope not. The Adventurers Guild collects extra dues from those members it deems to have 'questionable moral character', and you can barely afford to pay your rent as it is.

Tide surfaces and swims around you, giving you that predatory grin again. "Did I detect a sudden and substantial displacement of water?" he asks. "I think it happened right about here." You jump as he rubs his tail flukes along the length of your cock. "Tell me, human, does it excite you, thinking about what I'm going to do to you?"