"H...  Hello?" Eevee asked as he made his way between the blackened rocks, heat washing over him.  As he turned around an outcropping he stopped as he found the source of the heat: a pool of lava, its surface bubbling and rippling as the air shimmered above.

"You must be ambitious if you've come all this way to a place like this..." a voice said, Eevee gulping as he looked around.  Then the surface of the lava split around a form rising up, a Flareon revealing herself as she walked out of the lava as if it was water.  "Or maybe, just reckless," she said with a sly smirk as she shook lava out of her fur, the orange liquid sizzling as it dropped to the ground in her wake.

"I-I was told to see you...  About evolving..." Eevee said quietly as the Flareon approached him until she stood right in front, much larger than he was and towering over the small fox.

"Is that so?  I suppose I can help~  Walk with me."  Flareon reached down and pressed a paw against Eevee's back, nudging him towards the lava pool as she turned and walked to its edge.  Eevee reluctantly followed, bracing himself against the heat as it grew stronger the closer they got.  "I suppose you know what must be done by now~"

Eevee gulped and nodded, not prepared for what happened next.  Before he knew it Flareon had shoved him onto his back and kicked his head over the lava, the Eevee letting out a yelp and breathing heavily.  Flareon smiled down at him as she spread her legs and kneeled down,  her rear positioned over his crotch.

"You're in my lair now, sweetie...  I hope you can stand the heat."  With that Eevee felt her rubbing against his sheath, her warm fur thick and soft.  His member was quick to emerge, extending from its sheath and rubbing through Flareon's fur, leaving a wet trail behind.  Wordlessly Flareon raised her rear only to press it down, slipping Eevee's cock between her folds.

She was in total control, humping up and down against the little Eevee.  He moaned at her warmth, but it was impossible to keep his mind off the lava he was suspended over.  He glanced down at the lava bubbling beneath him, a mistake as Flareon took that moment to press a paw against his head.  He yelped as he found himself pressed down closed to the lava, the heat almost unbearable now.  Weakly he kicked his front paws in the air, teeth gritted as he looked up at Flareon with pleading eyes.

Unfortunately she seemed too distracted to notice or care for Eevee's plight, eyes closed and head raised in bless as she humped against Eevee like he was just a sex toy for her use.  Did she even know she was pushing Eevee down?  "M-Miss, could you-"

Flareon's eyes snapped open and she looked down at the Eevee, a frown on her face that soon twisted into a smile.  "What's wrong, dear?  A big strong Eevee must be able to withstand the heat, are you worried?"

"Yes...  I mean, no," he corrected himself too late, the damage was already done.  The frown spread across Flareon's face again as she stopped her humping.

"I see.  Well then, we have no use for a weak, scared, worried Eevee.  It's a shame you had to fail."

Her humping resumed again, her hips bucking against Eevee's crotch harder and harder as he began to whine and twist about, the paw pressing down on his jaw firm as it began to slowly push him down lower and lower.  Eevee screeched and begged for forgiveness as he felt his fur standing on end from the lava beneath, until his ear first dipped down into the searing hot liquid.

The pain was unlike anything he had ever felt before, his ear feeling as if it was on fire.  Fur and flesh sloughed off the air as Flareon only continued to push Eevee's head in, his other ear soon joining the first.  Tears of fear and pain streaked down Eevee's cheeks as he looked up at Flareon with wide eyes, the female grinning back.  Still she continued to hump him, his member thick and rigid even as pain began to embrace him.

Eevee's eyes were wide as he felt the back of his head press down against the lava, his ears melted away now and completely numb.  Pain began to fill his world as the only thing he could feel, that and the throbbing in his groin.  Despite his situation his crotch seemed to have a mind of its own, leaking pre into the Flareon's rear even as his head began to sink into the lava.  Flareon looked down at him and said something he couldn't hear, but from her lips it seemed to be...  "Goodbye, sweetie."

With that Flareon pressed down hard, submerging Eevee's entire head underneath the lava.  He tried to scream but all he managed was to swallow the impossibly hot liquid, his body filling with it now.  All other senses were blocked out as the pain and heat seared at his twitching body as he gave his death throes, his final movement being his member's climax.  His last seed sunk into the Flareon's cunt as she held his head under the lava, until at last it all fell still.

Flareon smirked and pulled Eevee back up, his head now a grisly sight.  His fur and skin were gone, leaving just a bare skull with tatters of meat attached to it.  At spots even the bone was melted right through, exposing the melted remains of his brain within.  "Hmph, and he had so much potential," Flareon said with a sigh, pulling off of the dead Eevee's member, still stiff from the blood trapped in it.  Casually she kicked his remains off the ground, watching as his corpse sunk into the lava.  It was slow to sink and she watched as the rest of his fur melted away, exposing bones that soon disappeared beneath the surface, never to be seen again.

Flareon turned away with a chuckle, dwelling on the seed he had provided her with his last moments of life.  Hopefully her own son wouldn't turn out as disappointing as the Eevee melting beneath the lava!