Brooke and Amy were in disbelief.
"You really have an open relationship with James?" Amy asked again.
"Yes," Cassie repeated patiently. "We've been open for almost six months now. It's been absolutely incredible."
"So you can both have sex with whoever you want?" Brooke was dubious, but there was an undercurrent of curiosity in her question. "And you don't get jealous?"
"Not really," Cassie shrugged. "I know how I make him feel. I'm happy to let him have some fun, especially when I know it's different with me."
"Ok, he might say that it's different with you, but how can you know that for sure?" Amy demanded. "It's not like you have a trustworthy first-hand account for the times he's not with you." Cassie raised her eyebrows meaningfully. "Wait... are you serious? You watch??"
Cassie laughed. "Oh yeah. It's one of my favorite things about our arrangement, actually. It's so fucking hot to see the person you love enjoying and being enjoyed by someone else."
"I don't believe you," Brooke said, praying her friend would take the bait.
"You want proof, huh?"
Brooke wanted to say yes, more than anything, but she was scared her friends would think she was a degenerate if she showed how intrigued she was by this conversation, so all she could do was plead silently that her friend would rise to her challenge.
Cassie turned from Brooke to Amy, both silent but staring, and laughed again. "Sure, I can show you some proof." She picked up her phone and called her boyfriend on FaceTime.
The screen lit up as James answered the call, head resting against a dark headboard and broad shoulders framed against a few haphazard pillows. "Hey," he said, gasping slightly. "How's my baby?"
"Pretty good, but Brooke and Amy are here with me, and they don't believe we're open," Cassie told him. "For some reason, they think I'm making it up."
"That's just because no one can imagine I'd ever be able to share you," James said. "But I know how much you love being shared. I know how much it means to you." James was panting slightly now, and it began to dawn on Brooke why he might be short of breath, why the proof of this FaceTime might be more that just James' testimony. A wicked smirk played on his lips as he grunted slightly and added, "And I know how much you love it when we share together."
"Mmhmm," Cassie agreed. "I think Brooke and Amy really need to be convinced, though. I think it will take a little more than that."
"You want me to prove it, baby?" Cassie nodded. "Alright, then. Allow me. This is Sophie."
With that, James flipped the camera so it was facing away from him, and Cassie, Brooke, and Amy were immediately greeted by a pair of creamy bouncing breasts, glowing gold in the evening sun that streamed through the open window. The breasts were tickled by waves of gleaming chestnut hair, spilling over the sweetly curved neck and shoulders of the beautiful woman riding James' cock. Her head was thrown back and her wet lips were parted, and as they watched, she let out a soft moan.
An incredulous "Oh my god" slipped from Amy's mouth.
"Are they watching?" Sophie panted, hands drifting up instinctively to cover her nipples, seemingly forgetting that there was also a cock slowly, obscenely thrusting in and out of her bare pussy.
"Absolutely," James replied. "She called, just like I said she would. Do you still want to show her how much fun we're having?"
"Oh yeah," Sophie said, stifling a deep groan. James had captured her nipple between his forefinger and thumb and was tugging on it gently.
"Excellent." He cupped his hand and let Sophie's breast bounce in his large palm, slapping softly in time with the rhythm his hips maintained, pushing deep into her over and over and over. "Cass, what do you want to see?"
Brooke turned to see her friend transfixed, eyes absolutely glued to the screen. After a moment, punctuated by Sophie's soft, juddering sighs, Cassie said, "I want to see her doing that."
"Doing what, baby?"
"What you're doing."