You urge her on, but let her finish on her own

"How does it feel...?" You whisper in Rachel's ear after another couple of moments, while you keep on watching as her hand moves firmly along her shaft. "I mean, to have someone else inside of you while you're playing with yourself?"

"It's... weird..." She mumbles, and blushes a little in embarrassment as she realize you've noticed, but continues what she's doing without pause. "What does it feel like, to be inside of a freak like me...?"

"Good." You tell her, without hesitation, though you must admit you're just a little uncertain about your feelings regarding her 'extras'. Ignoring that however, she's every bit as perfect as you could ever have hoped for, which you make sure to let her know about.

"Thanks...!" She's smiling back at you, and moan while you kiss and nibble at her slender neck. It seems like she's been really needing a good fuck like this, as you can feel her body already tensing up in anticipation for a coming orgasm. "Uhnnn... J-just keep on going! Just like that...!"

"Sure thing, babe!" You grin at her, while giving her a gentle bite, and then hold her tight as she suddenly start jerking herself with greater intensity. Just a few moments later she finally tense up, and you watch her curiously while she tries to surpress her own climax, which sees both of her hands completely smeared with her sticky spunk.

Meanwhile her pussy grips your own shaft tight like a vice, making you struggle to maintain control of yourself, and in the aftermath of her peak you must immediately start moving your hips again. From there it's just a couple of seconds before you're ready to unload yourself, though you wonder if it's safe to do so inside of her...