Rachel has a dancer's body; make her dance for you.

By evening, everything's in place and the guests have arrived. Due to your lack of imagination they're just a bunch of nondescript dudes, but that'll work just fine. When everyone's had time to grab a drink they gather around the huge cake that's strangely appeared in the middle of the room. You lean next to the cake and give Rachel instructions to begin, then take a seat to enjoy the show. Earlier, you told her that if she put on a sexy enough striptease you wouldn't let everyone **** her face. You can't wait to see the look in her eyes when you go back on that promise.

As a jazzy tune begins to play, the top of the cake ruptures and your sister emerges in tight black leotard. The outfit showcases her round ass and perfectly frames the curves of her slender body. Except for her tits. Those are too big to fit in the dancing outfit, which pushes them up and apart so that the soft flesh pours out either side. She might be a bit too topheavy to be an acrobat, but she looks like she'll be flexible enough for your purposes. Her compressed tits heave as a nervous Rachel eyes the crowd of men gawking at her. When she meets your eyes, though, she senses a tacit threat and meekly begins to dance.

At first, she's only swaying from side to side, but soon enough Rachel finds her groove. Swinging her arms and kicking her legs back, she begins to rotate around the "stage". When she spins to face away from the crowd, her barely covered ass comes into full view, bouncing vigorously in time with the music. It's so mesmerizing that, for a moment, you lose focus on all the ways you want to fuck her. But when she spins back around you see that the leotard is starting to tear around her breasts, and a flood of nasty ideas come rushing back into your head. Rachel doesn't notice what's happening until she tries to drop to the floor and do the splits. Suddenly, the upper half of the outfit rips apart and her left breast pops out into view. The crowd roars in delight, while Rachel scrambles to cover herself. Seems like the dance is over.

You stride up to your sister and roughly lift her to her feet, holding her to face the crowd. She's still trying to hold her outfit in place, so you pull her arms behind her back and hold them in place with one hand while the other reaches back around towards her tits. There's another roar from the crowd as you finally rip the leotard completely off. Pleased by this reaction, you decide to keep the show going. You shake Rachel's small frame around to get her tits bouncing at a nice rhythm. Every time there's a strong beat in the music you stop to give one of her tits a solid smack and let it ripple back into its pert, conical form. As the music speeds up you're slapping them faster and faster, and Rachel is squirming more energetically against your grip in response. Finally, after one last strike across both breasts, you let her drop to her knees with a whimper. The crowd of onlookers is practically frothing at the mouth, so you have an important decision to make.