Mary passed her black, polished, clawed fingernails over the vials in their large lacquered wooden box on the kitchen table. Each one tinkled as they jiggled in their places whilst Mary explained how they had been responsible for her remarkable transformation.
"With these, you can be anything you want to be, or have dreamed of being," she said to Lorna as her best friend perused the gold lettering beneath each vial. "Is it permanent? Are you like this for good now?" asked Lorna.
Mary tapped a single vial in a receptacle all by itself labelled 'human'. "I assume this is how you revert to human form" she let out a moan of arousal "though right now I can't imagine why I would want to".
Lorna's finger alighted on the top of a vial labelled "Incubus". She slid it out of its velvet lined place, her breathing showing audible sounds of excitement. "This one," she said decisively. "I've always wanted to know what it was like, to have a cock, to make love to someone with it. And what better counterpart to your Succubus?"
Mary grinned with her black lips as Lorna uncorked the vial and drank the contents down, before replacing it in its place. Sure enough, it immediately began to refill itself.
As had been the case with Mary, Lorna felt nothing immediately until she was suddenly struck by a burning pain in her gut which made her grab the table edge.
Her voice deepened as she groaned with pain and effort as her arms and thighs surged with muscle. Her breasts hardened and flattened out on her chest to become impressively defined pectoral muscles as her skin changed from its light tan to orange and finally the same deep red as that of Mary.
Her slender fingers thickened, large, hooked claws surging from her fingertips which she used to tear her now ill-fitting dress from her increasingly monstrous body. With a roar from her broad chest a pair of large, leathery wings exploded from her shoulderblades.
She reared up to her full height, some seven feet to Mary's six foot five, her features having metamorphosed to a masculine version of her human face, a neck that proceeded almost straight down, joined her head to her demonic body with corded ropes of muscle. Another grunt of effort saw a huge pair of black horns explode from her red skinned head, her brown hair falling out to leave her otherwise completely bald.
Between her legs her clitoris surged with growth, extending from the top of her vagina and increasing in size and definition, quickly assuming the shape of a functional penis. It continued past average for a human male until it stood some 12 inches in length and 5 in diameter. Behind it, a pair of huge, lemon sized gonads in a scrotal sac eased from her slimy wet vagina before it's petals sealed up perfectly around it.
The final changes saw a large, spade-headed tail mimic that of Mary's as it grew from the base of his spine. Steam rose from his feet and calves as they reformed into a pair of animalistic hooves. When he spoke, his voice was deep and guttural.
"Mary! I never dreamed of such a body and such incredible sensations! So...strong...so...hungry!" Mary stepped close to him so he could take her into his gigantic muscle-bound red arms and kissed him, their black lips and black tongues immediately desperate for the other's.
Lorna's prick aches with hardness, already drooling a thick precum from it's huge red helmet and Mary caressed it with her hot red fingers. "Fuck me, my darling mate. I know you have wanted me forever, even when we were human."
He wasted no time in moving them to the floor, Mary spreading her curvy thighs eagerly for him, and splaying herself wife with a snarl of lust. Hefting his giant erection he lined himself up, a little awkwardly with the newness of this body, and fed his twitching member into her devil's cunt with a rumbling growl of pleasure.
Lorna's infernal mind gloried with the sensation of his mate's hot, slick folds gloving him, enjoying that for a moment before he gave into the instinct to thrust. It was not long before his blood was up and he pounded Mary, his enormous crimson cock pistoning in and out of his lover's stretched, steaming hot cunt, each of them snorting and snarling their appreciation, Mary letting out a hiss between her sharp teeth as he breached her cervix.
He didn't recognise the strange sensation in his thighs, buttocks and groin as his climax built to begin with. As realisation dawned it spurred him on, his thrusts ever more save until he released heavily inside Mary as she screamed for him to do so. His meaty, demonic spunk cannoned up and from his painfully stiff penis as she rubbed her clit with one hand, her claws scraping his shoulder with the other as she showered him with her orgasm.