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At first, he was not very stoked about having a fully humanoid sized parasite latching onto his back, but the darn creature did give him some things in return of nesting in his literal guts.
For starters, it was nice of it to carry both the gun and the ammo disk for the entirety that they wandered the factory. And if it wasn’t digging its talons deeper into his chest, it also provided extra back protection. But that’s where its usefulness seemed to end. Until now…
The humanoid stands outside the large citadel and gazes upon the place. It’s a smell of fresh air, despite the absence of more life around. At least the critters from the factory couldn’t follow him here. A rare moment of true peace and safety. Greys and whites all around. A stark contrast versus the sickly purple, brown and other fleshy tones of what laid behind. However the statues look quite imposing, merely by their size… as well as the depictions. Which hadn’t been so prominent back in the other buildings, was obvious now: the sexual imageries spread across the site. It didn’t escape the humanoid man that multiple bodies were entwined with one another on an explicit, intimate level. Inside, one row of statues depicted a feminine humanoid orally pleasuring and fusing with the male humanoid’s groin area. The young humanoid keeps staring at the statue for an uncomfortable, unusual long time. It seems to awaken something in him that hadn’t been present before. The carapace crotch plates shift and retract, exposing the vulnerable phallus inside. Despite all statues depicting a mutual gratification, the male humanoid feels the pressure to find release, even without a partner. When he carefully wraps his bony fingers around the shaft, he twitches. A welcoming sensation, opposed to the pain experienced earlier. The motion comes almost naturally. He quickly pumps himself up and down until the shaft has become rigid. At the base, the flesh swells into a ball and throbs, aching to release its fluid. Muffled groans and puffs escape his lower face. His hand becomes slick with his own fluids in no-time, leaving no satisfying friction to his cock. This sudden shift in atmosphere alerts the parasite on his back. It presses the ammo desk into the humanoid’s rib and uses its spare hand to help out. This kind of help comes unexpected and at first, unwanted. The humanoid goes as far to immobilize both the parasite’s hands with his own, but the parasite is resourceful with its extra appendages. Unable to keep the weird tendril at bay, the male defencelessly watches the thick tentacle slither around his erection. Thanks to the special texture of the thing, friction is created once more. The feeling of helplessness and desperation rapidly turn into new waves of pleasure and lust. It drowns out all the previous pain of fighting and the parasite itself sticking parts where they shouldn’t belong. Thanks to the unpredictability of the tentacle’s strokes, there’s not clear rhythm to adapt to. He is completely surrendered to the other creature’s ministrations. His chest heavily rises and falls the longer it goes on. He’s fallen to his knees, because the sensations kept his legs trembling and unstable. Meanwhile the bulb at the base of his cock has grown in size. As the parasite concentrates itself fully on the humanoid’s shaft, its grasp around his hands have decreased. The young humanoid takes the opportunity to free his right hand. He carefully cups the bulb, rubbing over it. If he were to die on the spot, he wouldn’t have mind. The sensation is just that intense and wondrous. His moans fight their way out of his jaw. His entire body stiffens up when the parasite squeezes his cock a few times. The change of pacing and motions drive him over the edge. He bends over, planting both hands on the floor for some stability. A few spurts of seed splatter on the ground. He shudders when the parasite wraps its tentacle around his cock, giving it a final rub until he’s leaking even more.
It takes some time to recover from such intense orgasm, the first ever experienced. The male humanoid’s phallus has gotten all sensitive, so he’s glad when the plate covers the thing again. He quietly advances into the citadel and luckily, the parasite is pleasantly calm and quiet.