"...oooohhhhhhhh this is weird."
You jerk to a stop at the voice that had appeared to be speaking directly within your mind. Sophia comes to her own equally abrupt pause, pulling away from kissing you in order to look around. It's rather confusion for both of you - that voice, it had been feminine, but certainly not your own or your girlfriend's. It was more laid back, and a bit smoky in its own way.
It suddenly speaks up again, and once more you can't place where it originated from. Hey, uh... anyone out there? Can't really see a thing... or feel much... man, this is trippy..."
Ever the brasher of the couple, Sophia is the first to fire off a response. "Who the hell is that? And why are you creeping on me and my girlfriend?!"
"Woah, man, I don't creep on people." The voice seems a bit too... out of it, to be offended. "Hang on a sec, I think I can move my legs... just... gotta..."
There's an odd sensation of shifting down at the pink line where your body meets Sophia's, followed by pressure in your buttocks. It feels as if something is moving in your rear, bubbling almost in an effort to get out. In a hurry, you and your girlfriend roll onto your sides, and it's not a moment too soon as fleshy protrusions begin to extend out. You let out a confused and slightly scared whimper, but Sohpia just seems utterly fascinated.
Snaking out from your respective posteriors, the fleshy tentacles quickly take shape, forming into limbs. From your rear end has energed a pair of legs, long, lissom, and olive-skinned, separated from your own flesh by another pink line. They're quite attractive, if you're being honest, and you wish they could be wrapped around you. From Sohphia's rear has instead grown an pair of arms, the same skin tone as the legs, though one is covered in a beautiful multicolored tattoo sleeve, depicting a plethora of gorgeous designs and patterns.
"Oh yeah, that's way better." The voice almost seems to sigh. "Sorry about that. I'm Terri. You guys know what's going on?"
"Uhhh..." You stammer, quickly putting together the pieces in your mind - though actually explaining it is a bit more difficult. "I'm Bridgette, and this is my girlfriend, Sophia..." You trail off, watching as the arms feel around your shared body indepently of you or your girlfriend directing them. "I uh... I don't know why, but... I think, me and her and you... we're..."
You're cut off by a shock of pleasure as one hand lands on your breast, giving it a strong squeeze. You and Sophia both moan, as does Terri's voice, the erotic sensation shared across all of your minds. "Oh shit," Terri groans out, "Did you feel that too? Are we like... mind linked, or something?"
"More than a mind," Sophia interjects, unable to stop herself from rubbing a hand over her taut stomach. It's impossible not to shudder as the feeling reaches your brain - you know it's not your own stomach, but it's still part of what you are now, and still drives you wild. "Our bodies are... fused, somehow. No clue how you got in here, but... mmm..." She smiles, and you give her a raised eyebrow. You two had talked sometimes about having a threesome, but... well, it seemed like you were well past the discussion stages now.
Not that the new addition seemed to mind. "Oh, that's sick, man. Totally awesome." She stretches out her limbs, seemingly unable to force any more of herself out of your shared body. "Hey, listen, if you two gals wanna get in on, I'll go stay in the mind corner. Totally not here to kill your mood or get in the way or anything."
It's your turn to jump in. "No, no, it's fine... you kinda got stuck with us, and..." You pause to laugh. "We were gonna end up trying out poly stuff eventually."
"Right on, man." Terri gives you a thumbs up. "I'm kinda rusty with that stuff, but if I can make your fun times even funner, just say the word."