Dawn couldn't help but remember the way her brother had sounded as he pounded into her. Those bestial yells, his voice a low growl... it sent shivers down her spine. She wanted that, and more.
Emptying some of the salve onto her hand, she began massaging it into his throat. Instantly, his Adam's apple doubled in size. It was probably the size of an actual apple now, but Dawn wasn't done. She grabbed more cream and began rubbing it in. His vocal cords stretched longer and larger until his voice was only at the cusp of sounds people could hear. He'd be able to talk so low it could rattle furniture, in frequencies only an animal would be able to register. It would rumble in people's bones, a sound more felt than heard.
But unbeknownst to Dawn, there was something else. The ointment was magical, after all, and its effects were not limited to those based on science or even reality. As Dawn finished rubbing the ointment into his throat, she'd unwittingly given him something far more than a deep voice.
Joseph's voice now had a few unnatural properties. The first was the ability to make anything cum just by speaking. And by anything, I mean anything. People of all genders, animals, and plants. Even a stray bacteria might spontaneously divide itself if he so wished. Another ability was telekinesis. With practice, he'd be able to focus the soundwaves from his voice to move any object he pleased, manipulating and even destroying things in the process.
The last power was the ability to make any animal, human or otherwise, obey his commands. Anything he said would be listened to, any question answered. Anything he wanted, he would get. He was the true Alpha, and all of the animal kingdom would bow to him.
Of course, Dawn and Joseph were completely unaware of these facts. And so, Dawn put the ointment away and slumbered next to her brother, unaware of the sheer power she had released into the world.