Try to swim past the serpent

Noble or not, you're tired of being fucked, and this beast is enormous - even with the spells, he's going to split your ass in half. You dive, swimming down to the bottom of the passage, and catch at the uneven stones that pave the floor, pulling yourself along. The serpent coils and thrashes above you, apparently unable to find you.

Suddenly, a thick coil lands in the middle of your back, pinning you against the floor, and you slam your fists down against the stones in frustration. The coil lifts, but before you can scramble away, the serpent's muscular tail wraps thrice around your body, pinning your arms to your sides, and lifts you back to the surface.

"Cute," the serpent says. "Are you done now?"

"Hey, can't blame a guy for trying," you say, squirming for a moment as you try to free your arms, but the coils of the tail are like steel bands. "Yeah, I'm done. Just try not to kill me, okay?"

"You will not be harmed. The sorcerer has forbidden it."

"That's something, at least," you say as the serpent positions you astride his thick body, cold, slick scales pressing against your ass and inner thighs. "So, are you going to let go of me?"

"No. I find it hard to trust humans, and you tried to escape once already."

"Don't trust humans, huh?" you say. "But you trust the sorcerer to keep his promises?"

"The sorcerer is not human," the serpent says. "He is a golden serpent with god-like powers, and I have met many creatures who have had their dreams and desires made real by him. I have no doubt that he will fulfill mine as well, if I please him." He regards you for a moment. "I'm uncertain of how to proceed. This is important and I can't risk failure. Do you have any ideas?"