More Primal Forms

As the haze of lust took over, neither of the siblings noticed their bodies warping and transforming beyond the realms of human.

Elliott's form grew and twisted, his muscles becoming even more defined, power pulsing through with every thrust of his hips. His skin was soon coated in a layer of shiny black scales, however, and a flared hood cast a shadow across his face. His eyes darkened to a deep red as his teeth became sharp fangs in his mouth, drawing blood as they danced across Anna's neck.

As he was pounding into her, though, his cock began to change too. Gone was the veiny, human flesh, replaced with a long, black, barbed thing. They hooked into Anna's inner walls, never allowing her to escape his sexual desire without his release. As his new snake dick continued to thrust inside, another sensation crept up from his groin as a second penis, just as long and impressive as the first, grew down next to it. Not even registering the fact that he had two cocks now, he instantly put it to work, sliding it into his sister's ass. They worked together, pistoning in and out of both her holes in sync.

But Anna was going through changes of her own. Her body stretched and morphed to accomodate Elliott's inhuman size easily, her womb growing and becoming infinitely flexible, able to fit any dick inside her yet still clamp hold of it with tight, wet walls. Her asshole mirrored the changes, clinging to the new, spiked penis that was invading it.

Across her body, Anna grew a layer of soft auburn fur, rolling in waves like a mane. Two soft ears poked up from the top of hee skull, where they were immediately assaulted by Elliott's newly forked tongue flicking across her brand new erogenous zones. A feline tail sprouted abover her ass. Wild mewls and purrs burst from her throat as Elliott's thrusts grew harder and harder, bringing the, both to the verge of climax.

Then, suddenly, Anna spasmed, hot cunt-juice spilling over Elliott's shafts as he came harder than he ever had before. Soon her holes were overflowing with his thick, white spunk, her womb swollen as if she were pregnant. Which she probably was, she thought, with the sheer amount and virility of his seed.

But she didn't have to worry about that now. All she needed to do now was bathe in the afterglow with her bestial partner.