"Yes"

You grudgingly admit, "Yes."

Yes you want her to continue. Because you need to suck. You don’t want to walk out. You don’t want to leave from this place.

And so, bent over, she tells you “Shhhh. If you want it, and you don’t want to go, then Shhhhh and I’ll let you suck me later.”

Your mouth closes. She leans down. She runs her fingers over your rear. She spreads you wide. You feel something cool, stimulating, lubricant being rubbed over your rear. Slowly rubbed into place. Making you slick and ready. A hushed giggle comes from her. She slides between your legs, slipping the very tip of herself against your clenched rear entrance but she doesn’t slide inside. She just lets it sit there, waiting. You feel your tip just slightly pressed against your own rear entrance. You remain quiet because you fear not getting to suck. You need to suck. You will need to suck. You’re pleasantly surprised by the warm tingling sensation that quickly spreads out around the point of contact. And so, as you remain quiet, she pushes gently until just the tip of her cock slides inside of you.

You feel the flare of her head. The tightness of your rear around your head. Oh this is so weird and strange. Confusing even.

“Uhhh” She groans. Gasping with pleasure. She’s entered you. She’s filling you. You clench your buttocks. Resisting the idea of her thrusting into you. She grunts, claiming your rear. Part of you thinks, “Oh no, her cock is going into my rear. I won’t get to taste her cum. I won’t get to suck her off” Those thoughts come unbidden to your mind.

Something about her cock is enticing. Potent. Powerful. It’s as though there’s some nudge inside your mind, pushing you to open up for her, to give in for her for you know that you're also giving in to yourself. But she just has an inch inside you. The sensation is slightly uncomfortable as you feel your tight buttocks squeezing. This was an unexpected event afterall. But then she thrusts forward. And everything starts to feel just right. The same cock you got all lubricated up, that you worked over and sucked on deliciously is sliding into your rear. "Uhhhhnnngg". You try to resist groaning. You don’t want to let on how much you’re liking this as she pushes another half of an inch into you. Bending her body and pointing her cock at a downward angle so it brushes the front of your body. "Ooooh" it’s hitting just the right spots. You feel yourself tense, and you push back a little as if you’re trying to get yourself a little more comfortable but you only end up forcing more of her into yourself. You wonder if that was a subconscious desire, Now that you’re here, you might as well give in to it.

You let your body go limp. You feel one of her hands, on each of your hips, as she pulls you into her. You hear a smacking of your buttocks against her inner thighs. You feel a profound sense of fullness. Every little vein on her wonderful cock, pressing inside of you, massaging you, making your arousal oh so obvious. Maybe some groans escape. Maybe you just say “Yes, Yes, Yes”. Remembering her questions. Remembering her inquiry about what you wanted. She leans down right next to your ear. You can feel her breath as she covers you, leaning over your body. You can feel the sweat as her breasts press into your back. Her nipples are pointed. Her body is aroused too.

You feel drops of preparatory, Mmmmmm Ejaculatory agent just gently filling your rear. You squeeze around it. But then, the words escape your mouth amazingly, “Please…. Please cum in my mouth.”

The idea passes through you. You want her to cum into your mouth. You want to suck. You want to swallow. You want to serve that wonderful slick thrusting cock. But you’d rather be using your lips to suck it. You’d rather be up close and personal where you can just cross your eyes, zone out, and suck all your thoughts away…

But there’s nothing for it, she’s hitting the best spots inside of you… thrust, thrust, thrust…. Again, and again, and again. Even the quiet smacks of her working in you, the moans she's letting out. They are almost deafening as you lay there trying so hard not to cry out in sudden surprising pleasure. Ooooh this feels so good. Maybe you find yourself pressing back into her, but as you feel her and yourself on the verge of cumming she explains, “Don’t worry. I’m holding back. If you’re a good pet then I will let you drink my cum when I squirt."

"Now, Tighter.” The instruction goes right down your backbone. You feel yourself clenching your buttocks around your own cock. Gripping it with all you can and noticing the tightness that is your own rear. You feel the unexpected aggressiveness of your partner as she slams harder and faster into you... thrust, thrust, thrust. You feel it entering and leaving, it's becoming easier. There's a dull hum of pleasure from your buttocks which rivals that of your cock. This just feels so right. You're glad that you came here to the laboratory with her. You're glad you didn't leave when you had the question put to you. You're glad you got to taste her and you can't wait to do it again.

Being the vehicle for her pleasure feels so good as she continues... thrust, thrust... she's filling you, flooding you, using you. You're both the user and the used. The cock and the tight rear. And you feel as though you are only along for the ride, like a sleeve for her wonderful cock. And you want her to keep doing it, to let your body spasm and cum just from being filled with your cock...