Yes.

Every rational bone in your body tells you not to do it. To set it on fire or throw it in the ocean. Or, maybe the most prudent course of action, take it and your girlfriend to a medical professional who can figure out what the hell is going on.

But you know that you won't. You can't. The curiosity is too strong. And your phenomenally sexy girlfriend is sitting there, naked and practically begging to be fucked. God, her ass felt incredible...

“Fine. Give it here.” You do your best to feign resignation and ****, but it's a lie. You want this.

Dropping your boxers, Katie gets up and brings the thong over to you. She's excited and aroused. You can see it in her eyes. You suspect she would be even if she didn't have a living dildo trapped inside her.

You take it from her. It's the same material as hers, as you expected. Steeling your nerves one last time, you quickly step into the thong and pull it up to your waist before you can chicken out.

“There... happy?” For a second, you feel incredibly awkward, standing there in nothing but a black banana hammock.

But then Katie giggles and leans in to kiss you. Her newly enhanced breasts press against your bare torso deliciously and you reach down to feel them. Delighting in their wonderful softness and heft.

Her hand reaches down and begins to fondle you. Stroking you until your erection is poking out into the pouch of the thong.

And that's when you feel it: a thousand fingers sliding up and down your shaft. A thousand more caressing your testicles. Katie notices your reaction and breaks away.

“I know that look.” She comments impishly. You nod, finally understanding what she was feeling in the car last night. It's so subtle and yet so distracting. Impossible to describe, yet more than enough to keep you erect. Most of all, you want more.

“Come. Sit down. It gets better.” She takes your hand and leads to the sofa. As you sit, you look down at your manhood. The pouch for your cock is no longer tented out around it. Instead, it has begun to draw in against you, forming itself to the surface of your shaft.

You reach down and touch it. The material is already stuck on, the sensation of your fingers only slightly dulled. Like touching yourself through an extra-thin condom.

“It's OK. Just let it do what it wants to do.” Katie reassures you, sliding her hand underneath yours and gently stroking the length with her fingertips. Her caress feels delightful and you let her take over, gently adding her own visible touch to the invisible fingers still working away.

Her eyes close and her breathing begins to deepen. You're not the only one being pleasured right now, but there's something satisfying about sharing the experience with her. With every passing moment, the material coating your cock grows more fervent in its stimulation. You begin to wonder: Will it be enough to make you cum? It certainly is for Katie. What will that be like?

The sensations begin to move away from your shaft, focusing instead on your sensitive tip. You suck in a sharp breath as they begin to stimulate and then overstimulate you there. Making you twitch and shudder at their touch.

“Shh... just let it work.” Katie pulls your hand away from your package as you unconsciously, involuntarily reach down to stop whatever it is from overstimulating you anymore.

“It's too much.” You wince. “Too... much. OH!” Suddenly the stimulation moves from outside the tip to inside the tip. Something is moving inside your urethra. You can feel it inside your shaft. Inside your pelvis. Inside your testicles. Everything, inside and out, is being touched. Everything is tingling with an unnatural sensation.

“What happened?” Katie pants, thoroughly distracted by her own pleasure, but still concerned about you.

“It's... inside me.” You explain, the irony of the situation not lost on either of you.

She giggles. “Doesn't it feel good?”

Does it feel good? You're not sure. It unlike anything you've ever felt before and the strangeness of it all is disorienting. And yet, as you let yourself grow accustomed to it. As you relax and feel the warmth spreading over your cock and testicles. As you let your body be taken over by the gentle pulsing, throbbing, ebb and flow of the sensations washing over you. You decide that, yes, it does feel good. It feels very, very good.

“Get over here and suck my cock.” You groan. You don't care if there's a black sheen covering it. And frankly, you don't need the stimulation. You just want to see Katie with it in your mouth.

Katie, however, is preoccupied. “Just... one.... second... OHH!” Arching her back, she cries out in ecstasy as the orgasm that had been building hits her. Thoroughly out of breath, she looks over at you with a goofy grin.

“OK. That's better.” Clambering down to her hands and knees, she quickly gets her mouth around your cock and begins sucking.

“Fuck that's sexy.” You murmur, looking down at the top of your girlfriend's brunette head as she eagerly slurps away. As you expected, the sensation of her tongue and mouth is still muted, but seemingly less so every second.

But that's beside the point. You're aroused. More aroused than you've ever been, you think. And the physical stimulation the thing inside you is providing just isn't enough. You need visual stimulation. Mental stimulation. You crave it. And now that you've got it, the whole package has put you into a state of complete euphoria.

“That's it. Suck my cock. Suck it. Suck it!” The orgasm builds up quickly and then explodes. Shooting cum into Katie's mouth in a brief, but intense climax.