Jake thought the witch's potion tasted like a sort of extremely salty chicken broth with eggs, along with other components that tasted truly vile. He wished he could vomit the foul potion or punch the witch who had stepped back with a wide grin. However, his stomach had no time to even consider such a possibility. The magical potion went to work immediately.
Jake's bones snapped all of a sudden in different direction. His ankles elongated dramatically and twisted backwards. His toes spread, twisted themselves in different directions and his nails became claws. His fingers became atrophied except one who lengthened horribly. All his bones became long, thin and brittle-looking. Even his backside sprouted a tiny one. Then, horrifyingly, his teeth fell out while new sharp, small and dainty ones replaced them straight from his gums. Jake could not even scream out his terror anymore. He just flapped his stick-like deformed arms, also now utterly hairless in a sort of grotesque panic. His scalp hair fell out as swell in clumps. His clothes got ripped and Jake was now naked, flapping his penis around as his movements started being more frantic. His testicles swayed quickly too but it was the least of his worries, as was his nakedness. They stopped being part of his crotch soon enough anyway because his testicles decided to retreat into his crotch and settle comfortably as ovaries on each side of Jake's new reproductive system, never to move again and destined to produce few precious eggs instead of countless swimming and competing sperms. As for his penis, it simply merged with his crotch and disappeared from existence. Now, Jake's anus would do everything: defecate, urinate, welcome a penis and lay eggs. Jake could feel new tubes of flesh helping out with these new functions inside of him, while his old human urethra vanished in turn, now useless and a mere encumbrance. Jake just squawked his pain and terror. His eyes closed as they became sharper in vision and yellow. Feathers sprouted out of his skin, even covering the arrogant chest, female and thus complete with all the apparatus to breastfeed in the future, and very much so, accordingly offering a sort of modesty. The feathers were bright orange and golden, and longer on his scalp, providing odd sorts of locks. His legs had covered themselves in scales. Jake felt he was a giant hen but he could sense he had sharp talons and a human-size for something else. He was now a harpy, and a female one at that. His lips were now pouty and hid sharp teeth made to eat flesh. His new heart-shaped face was youthful and innocent-looking to lure hapless victims to him. As Jake flapped his wings, still outraged at being male no longer, he looked straight at the witch through the bars of his cage and asked her what she wanted of him. Jake did not show it but his voice was soft and sultry now, which annoyed him to no end.