Ebony, of course and she's pretending to be pissed.

The black woman wasn’t radiating the cold fury of earlier, this was the white hot rage of a woman catching her man cheating, or at least a good facsimile thereof. “You bitch,” she said, quite quietly, given that she was supposedly furious.

Ivory gagged and pulled off his cock, Ken let her. “Ebony,” a cruel smile appeared, but before she could say something vindictive, Ebony lit into her about how she’d fucked her boyfriends before.

Ken cut her off, “Of course she does. It’s the closest she can get within her…orthodox world view to actually fucking you.”

“What?” Ivory asked, while Ebony just barely suppressed the question.

“Think about it, you try to fuck people who fuck Ebony, as soon as possible after they do so. You were practically panting watching us fuck and it wasn’t about me. Hell, you were drooling at the sight of white guys fucking black women out there. It’s why you come to this stupid fucking shop. You want her, you just can’t admit it to yourself.”

“No, we’re just, competitive,” Ivory stuttered.

“No, you keep trying to piss her off, you keep trying to get her to yell at you. This whole thing was about two things, getting her off my cock, you know, the one that was just down your throat, claiming that part of her and it was about making her angry.”

“Why would she want that?” Ebony asked, beating Ivory to the question and taking control of the conversation (or at least more control than Ivory had).

“Because she wants two things, she wants you to punish her and she wants you to touch her. She gets off on it—“

“No, I don—“ Ivory interrupted him.

She was interrupted in turn by Ken spreading her legs with strong hands and slipping two fingers into her pussy, making an undeniably squishy noise, before pulling fingers, glittering with cunt juice out, “Just talking about it makes you soaked,” he said and he was pretty sure she actually was even wetter than she had been.

“No…” Ivory whispered despairingly.

“Yes, you want her to be in charge, you want her to command you, to punish you, that’s why you’re always acting up,” Ken waved Ebony over.

“No,” Ivory repeated, not at all forcefully.

Ebony stepped forward, forcing Ivory back against the wall, exactly as Ken had done to her, but instead of tying her up, she produced a pair of padded handcuffs.

“Yes,” she said, affixing them to Ivory’s unresisting hands and binding them behind her back. “And you have certainly earned your punishment.”

“But what about him,” Ivory wailed about the unfairness.

“Ken? He’s free to fuck whoever he wants, but you didn’t know that, you tried to take him from me and for that, you’ll be punished, severely.”

“Yes,” Ivory whispered, but instead of despair there was joy in her voice.

Ebony slapped her hard, leaving a red handprint on her face, “Yes, what?”

“Yes, mistress,” Ivory replied instantly and Ken made a mental note to search for the stack of lesbian BDSM porn that was probably badly hidden somewhere in her house.

“Good girl,” Ebony replied, before explaining Ivory’s punishment.