Whirlpool
The bear sat in the whirlpool tub, his massive wide receiver's hands resting on the edge of the bath. At least a good hour of soaking under the churning waters was called for after running his knees ragged during the match. His head lay back as the warm whirlpool unknotted his fatigued muscles with each change of the miniature current.
Something grabbed him from behind, gripping his head as it lifted his face up only to violate his mouth with a rough kiss. An unwanted tongue snaked against his, making him thrash against the water and against the walls of the silver tub as he struggled. He recognized Cy, the smell of the defensive linesman's sweaty boar body already mingling with the musk in the therapy room as the assault continued
The sudden removal of that tongue from his mouth left him breathless and weaker than he had felt right after the game. The boar gave him no time to recover as he climbed into the tub, shedding his jock strap as the bear coughed, trying to force the taste of his teammate out of his mouth. The linesman's fat dick dripped precum into the water, black drops dissolving into the therapeutic froth. Then he slowly lowered himself into the water, a knee at a time until his face was flush with the bear's. Cy's eyes were hungry for his body, obvious as the muscled, chubby boar held his shoulders against the tub, making his attempts to climb out futile.
The boar's tongue was a long black appendage that suddenly licked at his throat and his face. Tasting the sweet musk of unwilling heat and hard earned sweat. It made the bear shiver to see something so wrong with Cy's tongue as it moved lower and coolly circled his nipples. The tongue found them easily even in the bushy brown grizzly's fur.
Whatever had made the boar like this was also responsible for the subtle aphrodisiacs in the slick trail left by his black tongue. Where it licked, the bear found his body responding in the need to be touched and roughly taken. The boar's tortuous path down his chest led to his real target. Cy's mouth came down against his belly button, and the tongue thickened as it probed there for a moment, then speared him.
The bear jerked in the water, the reluctant moans turned to screaming as he felt it growing into him. The tongue had become a tentacle writhing into his body, moving inside him in ways that made his organs shift and muscles contract as it simply invaded him. The black thing seemed to never stop as Cy's mouth stayed planted against his navel. Then, he felt the last of it slip inside. The tentacle detached from the boar's tongue, still leaving it black and ready to repeat its reproduction inside a new body.
The sensations inside the bear were incredible. Every organ, every muscle and nerve was embraced by the creature that budded off and claimed his body. He opened his eyes and saw the boar smiling as he saw the tentacle bulge against his skin and fur. It felt right.
Even as it wrapped itself around his heart and lungs, slipped inside his spinal chord and wrapped the main conduit of control in taut black, he felt wonderful. He opened his legs, leaning forward and pulling the boar to him. Their crotches ground against one another, the whirlpool waters making it easy for the stimulation to make him as hard as Cy.
He had never thought about his teammate like the new black ganglia in his brain told him to. He was thankful to Cy for the way what was inside him moved to claim his body and felt warm as it integrated into every system. His cock rose as his freed hands wrapped around his member and Cy's. The boar's blank eyes devoted to the black infestor and to the bear that now shared it.
They kissed with tongues that were now similar, slick black things that danced around one another in open mouths. The bear's eyes were wide, empty things that reflected the delicate rewiring being done as neuron after neuron changed with a black flicker.
Cy came first, rewarded for having spread to a viable body that could then share with others. It would only take hours for the next creature to breed inside the bear. The boar's cock throbbed in the water, black seed darkening the whirlpool and clinging in strings to their fur.
The bear's release overwhelmed his last untainted thoughts. His old personality would only be of importance for camouflage to spread again as his cock spurted inky seed for minutes. The rich black cum made him horny again as he reluctantly climbed out of the tub, followed by Cy. Neither hid themselves under a towel, freed of inhibitions by the invasion of their bodies.
When the lanky cheetah came to clean the locker rooms, they waited until they heard him start to masturbate in the whirlpool before closing the door and greeting him.