Into rough hewn tunnels

Stacy gasped with the sudden shock of it. The alien, inverse, invasion of her body’s fundamental workings. ‘Thank goodness I sucked it as long as I did!’ was all she could think as the slightly soothing feel of her own saliva dribbled out from her sphincter. She had been so relaxed… so ready to accept another cock into her pussy’s collection. That must have been how he got so far in before any part of her realised the terrible mistake. Now though… now every muscle within her had clenched up tight, she could barely breathe with the shock of it. Like jumping into icy water. Behind her she heard bated breaths as well, Terry must be feeling the pressure of every ounce of her musculature squeezing down on his swollen cock. Any moment now… Any moment he would recover enough to realise his innocent mistake and pull this great, bloody battering ram out of her anus…

She felt his hands upon her hips. Felt the push and pull, the gradual ease of pressure. Any moment now, he’d be out. The pain would be over. Though even she could feel how the coursing tension of her own body now provided an antagonist, grasping onto his invading limb and holding oh so tightly to it. He pulled back… and back… and pushed straight back in!

The schoolgirl felt tears well up in her eyes. Felt even more air knocked out of her lungs, just when she thought she didn’t have any more left. She couldn’t speak, or cry out, or moan. He pulled back once again… and drove forward. Stacy clung on to the wall in front of her for dear life, the only solidarity she could find. Her head hung low and loose. Her vision swam with tears and delusions. He slid out a bit… and delved further. Each time she felt him bury himself deeper and deeper into her bowels. Her stomach churned at the thought. It felt like each new push might just be the one to burst into that hole at the centre of her. Her entire soul felt like it wanted to dry retch with each new burrowing thrust.

...And yet her body betrayed her. With every shuddering invasion it let go its resistance just that little bit more. It let him reach just that extra step further. It gripped and grasped at him just that little less aggressively. At some point her breath had returned, and she hadn’t even noticed. She heard her own puffing exhalations echoing around her skull… and… were they moans? She felt the slap of his balls against her unused pussy and realised she must have taken in all of him. Felt the bruising slide of his shaft within her and realised the pain was echoing into memory. Fresh memory, of course. And it was still not exactly comfortable… yet there again rose a nagging little voice in the base of her skull. A masochistic little imp of pride which whispered “I’m being fucked in the ass! The older brother of one of my friends is shoving his big, fat cock all the way into my anus at the back of a cinema full of people!”

Stacy lifted her neck once more, till she could see out of that grimy, little window. Watch the shuffling, writhing silhouettes dance in front of the screen, none the wiser of what was happening behind them. Heck the speakers were so loud she could be screaming and moaning at the top of her lungs and they wouldn’t be able to hear. She tried a few experimental yelps, just at the peak of his thrusts. They seemed to help solidify the changing rush of her emotions. This was horrible. It was grinding, and sore, and invasive and stomach churningly uncomfortable. Yet already she could feel herself enjoying it. Feel her other erogenous zones crying out in jealousy. She was being fucked square in the ass by a boy who’d more decided she would do for a test subject than asked if she would be his lover… and she was beginning to love every second of it.