At Brooke's insistence, you resume thrusting, plunging your penis-- her sister-- as deep into her ass as it will go. Both of them are moaning now. Kira's confusion subsides as she decides it really doesn't matter which of her sister's orifices are stimulating her, just as Brooke had hoped. "Mmm," says Brooke. "Faster, babe. Harder." Obligingly you pick up the pace. The pleasure is immense.
"Ohh... I'm close," you tell her. "I'm... almost there..." You still can't believe Brooke is allowing you to do this-- no, not even allowing, but ENCOURAGING it.
So it comes as a bit of a shock and a disappointment when Brooke next says, "Okay, hon. Now stop."
"What?" you say, feeling a bit cheated. "But, babe... I'm so close now..."
"I don't want you cumming now," says Brooke. "At least, not yet. Remember, we're having some fun with Kira. I want to try something else. Don't worry, honey. I promise this will be fun." Brooke gives you a wink. You do trust her, so against the will of your libido, you pull your rock-hard shaft out of Brooke's ass.
Kira, of course, protests. "No! Me cock! Want fuck! Need fuck!" But you decide to ignore her complaints, at least for now. Whatever Brooke has in mind, she seems to be really excited about it.
Brooke reaches across the bed to the box containing the rest of the jewelry from the magic object shop, and takes out the bracelet. You almost had forgotten you even had the rest of these items. With that sweet smile you've come to love so much, she hands it to you and says, "Here, babe. Put this on."
"The Body Changing Bracelet?" you ask, unsurely. "You... want me to change myself?"
"I want you to see what orgasm feels like from a girl's perspective," replies Brooke, grinning lustily. She motions toward your penis. "And I want to see what happens to her when she goes from being a dick to a pussy."
"Pussy!" shouts Kira instinctively at the mention of the word. "Want pussy!" Overcome by Kira's desire, you slip on the bracelet. "Okay, how does this work?" you ask.
Brooke looks over the instructions again. "It says you just have to imagine the changes. So, I guess, you just think of yourself being female."
You sit on the bed with your eyes closed and try to clear your mind-- which isn't easy, with Kira's emotional influence still surging through you. "I am female," you think to yourself, silently. "I have a thin waist, and boobs, and a vagi--" A sudden sensation, like a jolt of electricity, passes over you and shocks you into opening your eyes. "It's happening!" Brooke exclaims. And indeed it is-- before your very eyes, your body is changing. You watch as your hands become more dainty and feminine, with slender fingers. You feel your waist narrowing and your buttocks rounding out, giving you more of an hourglass figure. You feel your face and realize any residual facial hair is now gone, and your short hair has grown out to your shoulders. A growing feeling of weight pulling on your chest alerts you to the realization that you now truly do have a pair of breasts. You watch in rapt disbelief as they grow, from A-cups, past B and C, and finish as nice round D-cups. You giggle girlishly when you realize they're even bigger than Brooke's, now.
Then it's time for the main event, so to speak. Your focus turns from your chest to your crotch. The rest of your body has become female, and now it's Kira's turn. You gaze down at her, incredulously, and notice...