Jeff felt something start to happen with his body, and looking down, he could tell that Hailey was busy getting ready to work on his new form. He gave one final glance over to his father, then looked down at himself from that point on.
As he expected, Hailey would begin where it counted, his chest. Pushing out from his body, a pair of natural looking breasts of significant size were formed. They were sorta heavy, but more than manageable enough thanks to Hailey supporting them wonderfully. Jeff gave them a poke and squealed as the feeling of pleasure was so strong that it borderlined on actually being painful. His breasts were way too sensitive.
Now panting while drenched in a cold sweat, he felt his breasts tingle a bit, then his sister's voice sounded within his head. "Oops, sorry about that Sis, I toned them down quite a bit. Try touching them now."
Jeff hesitantly did as requested and touched his left breast. His knees felt slightly weak as his body was once again racked with pleasure that reached every possible nerve ending. But at least now it didn't hurt. Hailey made note of the improvement, then while his hand was still in contact with his left tit, she lowered his sensitivity to just past the point where he can no longer maintain a focused thought.
Hailey was satisfied with this. Now if anything other than clothing so much as touched her wearer's breasts, she would stop being able to continue thinking about anything other than the pleasure coming from her boobs.
Jeff was lewdly panting with his tongue lulled out of his mouth and on shaky knees. Both of his hands were groping his new double H-cup breasts from underneath his bra sister. And so, after witnessing the current state of her soon to be sister, Hailey felt that Jeff's masculinity was the next thing on the docket.
Easily, the first thing to go was his male voice. And while Jeff could barely tell in his current state of mind, but as his pants became higher pitched, and grunts turned into seductive moans, he had a good idea on what she did to his neck.
In his new feminine voice, Jeff started moaning more often, making the entire ordeal seem all the more lewder. But Hailey wasn't done with him yet. She moved upwards, femininity his facial features as she moved her focus upwards, until her former brother had an indistinguishably feminine face, albeit a rather lewd one at the moment.
But Hailey felt she could still do better. So she turned her attention to Jeff's tongue and grew it out to about 3 feet long and topped it off with a 6 inch long, center split at the tip. Long enough for Jeff to reach his pussy with it. She also pointed and lengthened his ears, giving him the appearance of an elf.
To finish off his head, Hailey grew out his hair, turning it a very light, platinum blonde color in the process. She continued to grow it out until it reached passed Jeff's calves then stopped. And after giving it a lot more volume, she was satisfied and move on down to the rest of his body.
But before that, Hailey was going to make one thing clear to Jeff. She spoke up in his head after manipulating his hands with her bra straps in order to pull them away from his tits, "Alright, now listen to me. From now on, you are my sister. You are my FEMALE sister. Got it?" Jeff nodded her head but then agreed telepathically as well.
"Good! Now then, time for the rest of your body."