Could be the Slither

"Adam!" Linda tightened her hold on her hunky son as both of their eyes searched frantically through the chamber, but saw nothing. The emergency lighting did not provide much visibility in the cavernous room.

Adam felt his mother trembling, the nipples on her soft cushiony tits hardening like stones against his muscular abdomen. Despite the alarm he initially felt, his cock began once again to stiffen at the tight feel of his mother's hourglass curves.

"I can't believe they let you use a Gorgon cage for a Slither!" Adam protested. "Of all the fucking shortcuts they could have chosen."

Adam had seen Slithers, though not during mating season. He had read about them in his schooling. Three worm-like appendages snaked out from the main body of the creature, the main body itself worm-like, about two feet in diameter and ten feet long. The problem with this description is that the Slither's body was extremely malleable.

It could adapt its shape just like a snake swallowing a whole rodent. It could expand or shrink quite flexibly. The worm arms could be held in or expand out up to about ten feet and were usually about six inches in diameter. The arms expanded and hardened during mating season in the presence of a female, which is when they ejaculated cockadu. Cockadu was a potent delicacy coveted throughout the galaxy, noted for its viscous texture and rather bitter salty flavor.

Adam remembered having some with caviar and crackers once and couldn't fathom the appeal.

"Well, we'll have to look for it and kill it." Adam decided.

"But Adam," his mother protested, thinking of the lost profit. She reluctantly let go of her son, the sensation of the impression of his hard muscles still tingling her impressive breasts.

"Mom, it's insured, and it's just too dangerous. I don't want to try to capture it." Adam insisted. "In fact, I want you to stay with me during the search. I hear these things go crazy for females of any species when they're in heat.

Linda Carter shuddered at the thought of the oily appendages of the Slither oozing out and grabbing her as she rounded a corner.

"I'm with you, honey." Her delicate hands caressed a muscular biceps, her head nuzzling her boy's neck.

"In fact, Mom," and this was hard to say, "It might be best for you to be locked in your cabin and let me go on this hunt alone. We don't want to risk getting the creature even more riled up." Feeling his throbbing dick as he looked down his mother's flimsy top to her incredible tits, he could well understand what the beast might get excited about.