Looking well over 300 pounds each of the Avengers looked like a cross between a grizzly bear, a cow and a stegosaurus. Their bodies were completely covered in thick shaggy fur, their hands and feet sporting long black claws that were padded and heavy like lion’s paws. Their faces had changed as well, pushed forward into short muzzles, their noses were flat and broad, on top of their heads stubby horns grew just over their brows, with Steve and Tony’s horns arching forward almost like bull horns. Squirming in his seat Cap gave his heavy long tail room to curl down to wrap around his feet, the tip sporting a mass of boney spikes like a club or stinger. It was a strange sensation for the former super soldier to feel his tail flicker at his feet, the thing more than twice the length of his legs and just as thick around. Each of the Avengers had tails of their own except Natasha, instead she had six hands! Each one roamed around her belly to calm the storm of activity inside of her, occasionally her lowest clawed hand would divert to scratch at an itch on her thigh.

Stark had to shuffle in his seat, the spines lining his back dug and scratched into the cushion behind him on the couch causing long rips down the leather covering. "Stupid things… These seats aren’t cheap!"

"Hey you’re not the only one with problems here." Ruffling up her wings from behind the couch Miss Marvel frowned at the dark furred beast man sitting across from her. Unlike the others her fur was dark blue, a strange reaction to the Kree DNA in her system as well as the pair of leathery wings she had draped behind her seat. Arching her back Carol moaned rubbing the heavy orb that was her belly, its surface rippling with little bumps her claws would occasionally rub over. "Feels like I’ve got a small soccer team inside of me."

"You’re… ‘Hmmm’… You’re telling me." Moaned She-Hulk, her eyes closed rubbing a sensitive spot on her on belly. Her fur was green just like the rest of her, the dress she wore looking skin tight over her body. Steve looked her over, unconsciously flaring his nostrils at the sight of her. Like everyone else her athletic figure was gone! Now she was full bodied and voluptuous, her hips flared out two feet wide with an ass that curved out behind her like a pair of basketballs, her thick tail curled around her twitching with each gasp she exhaled. Her breasts were almost the size of her own head, threatening to burst open the v-cut to her top, even so the milk stained fabric showed her nipples were stiff and tenting, capped with wide areolas as wide around as tea plates. Steve knew deep down inside that the litter kicking around in Jen’s womb were his, the thought sent a strange sense of pride rushing through him. Eyeing her bulk and curves Cap slowly widened his stance at his seat, his shorts tenting as blood rushed to his rising groin.

"I… I think I should call it a night, get some sleep and see what… See what fits me back in my room." Slowly getting up Captain America hunched forward scratching his leg to hide the erection he was trying to keep down. Once he was out of the living room and heading for the stairs he could hear the others through his pointed ears that they too were heading off to other parts of the mansion.

***

Tossing heavily in bed Cap moaned in discomfort, it was hard enough that even with the Pym particles he was still bigger than a football player but the spines on his back and the tail hanging off the edge of his mattress made tearing sounds against the blankets and carpet that kept him from sleeping soundly. Not only that but the erection throbbing in his shorts still hadn’t died down, looking almost like it could burst the seams any minute. Splayed out on his back Steve groaned, a frown on his muzzle trying to calm the bulge in his shorts until he heard his door open in the night’s darkness.

Looking up he couldn’t see a thing but he could feel something large move up the front of his bed where multiple hands grasped and caressed his crotch and legs. Leaning back Steve could feel his legs being gently pushed aside, his shorts pulled down where a rough tongue licked up its growing length. "Mmm, to think Carol and Jen got to have some of this…"

"Natasha?"

Finally making out her black furred form in the darkness Black Widow smiled back at the blonde furred behemoth and continued to lick and pump his length, his hips bucking without his consent at her ministrations. Gripping at the bed frame Steve watched gritting his fanged teeth as she expertly brought him to full length, stopping only momentarily Natasha pulled her shirt up to release her melon sized breasts, the pair sloshing heavily before she sandwiched them around his throbbing cock and continued to tease him.

"Look at how big they are Steve, they’re so heavy…" Easily in the K cup range Natasha squeezed her breasts together, milk dripping from her thick nipples from the pressure while she licked at his tip. "I’m… I’m so fat Steve, please tell me I’m still beautiful… Even as a monster." Sliding up from where she knelt Natasha moved up over the bed until she straddled Cap’s waist, a desperate look in her eyes just as she pulled her shorts to the side and positioned Steve’s erection to her drooling pussy and sunk down on him. Gasping from her vice like grip his claws snapped around to grip at her wide hips and ass possessively, his own hips bucking roughly under her and causing Black Widow to moan with each thrust.

Unbeknownst to the two behemoths while they ground and bucked against each other, their bodies slowly swelled and grew. Growling under his breath Steve felt his shorts get tighter until they tore and burst off his legs and waist, his head bumping the wall behind him. Natasha gasped when her shirt ripped open at the back, falling over her melon sized breasts and slid down her beanbag sized belly, her own shorts bursting apart to make room for her expanding hips and thighs. After more than a minute the bed collapsed under the two, their combined weight being far too much for the broken furniture to bear. Yet through all of this neither cared, both Behemoths were caught in the haze of heat and continued to mate even when their backs bumped into the adjacent walls.

With a bellowing roar Steve came hard! Spewing what felt like a gallon of seed into Natasha and causing the walls around the bedroom to collapse and explode outward, the two falling on their backs now that they had the room to do so. Easily the size of elephants the two Behemoths panted and breathed heavily, still growing if ever so slowly.