Yes, you break her.

"...I love your dick," Candace exclaims louder than she probably intended.
"Fuck me harder then slut," you reply.

She nods and forces herself down onto your dick harder. This is aided by Donna and Natalie, who continue to press down on her shoulders with each thrust.

After a few minutes of this, Candace is nearly at orgasm. However...

"Please fuck me back, Master," Candace says, "I can't cum on my own."
"Too bad," you say sharply, "Find another way."
"...Donna...would you please rub my clit. Please!"

You and Donna share a quick look and smile. Natalie and Donna share one as well & the former nods. The latter moves her hand from the Nubian girl's shoulder and slowly down her body.

While Candace continues to fuck herself (aided by Natalie's ****) against you, Donna's bound hands slowly run down her friend's body. She stops at the chest, getting a good feel of her breasts. She even pinches one of the nipples for a moment. They move down the woman's stomach and stopping just short of her pussy.

Candace looks over at Donna and mouths 'Please' to her. Donna nods and finally does the deed. She spreads the co-ed's lips with a couple of fingers and uses her other digits to manipulate Candace's clitoris.

"That's it! That's it! I'm going to cum," Candace cries out.
"Ask permission," you demand.
"....what?!?"
"You'll ask permission to cum. If you don't, I'll whip that pussy. Got it?!?"
"Yes, Master. I'm...i'm sorry."

To help you punish her, Donna rubs Candace's clitoris even harder and fingers her with any free digits. You, in turn, reach up and begin to fondle Candace's breasts.

"May...may I cum please, Master?"
"On the count of three. Three...," you say, pausing a while, "Two..."

Candace's face is strained as she tries to hold back her oncoming orgasm. She knows what will happen if she does it early, so she is trying her hardest to not cum.

"Oh right. Where was I," you say, mocking ignorance, "One. Cum for me, whore!"
"Oh shit- it's a big one," Candace exclaims, her body finally getting release, "I'm going to cum for my Master!!!"

Throwing all of her previous shame and shyness out the window, Candace orgasms for you. It seems as if bolts of electricity are shooting through her body as she cums! She leaves a small puddle of juices around the base of your cock as well. Her eyes roll into the back of her head and she seems to pass out from her orgasm.

Donna and Natalie grab the now-comatose Candace under her arms & pull her off of your dick. They set her down on the ground in front of you and stare at your still-hard cock, covered in Candace's juices.

"Good job, ladies," you say, "Now I just have to decide who won."