Surprises you from behind (A speedy fuck)

You get a few seconds to look at Sia before she springs off the wall and disappears in the darkness again. Did she not actually see you? You step closer to the wall and take a good look at it, to see where she's gone. But then, for a split second, you hear something behind you, almost like running. You don't even get a chance to turn around, before something crashes into you and presses you against the wall, not too painfully, but just hard enough that you can't move. You manage to turn your head and see the familiar face of Sia smiling at you through the darkness.

She holds you flat against the wall with her hands and leans in close to whisper in your ear. "Gotcha! I even gave you a chance to escape, but hey, too late now. Now let's get this pesky thing here off..."

You then feel her hand slide down to your butt and grip on to the fabric covering it. She rips it off with one clean pull and throws it aside.

You nervously ask "What... what are you going to do with me?"

She giggles to herself and whispers "It's a good thing you're up against a wall because I want to see just how fast I can fuck your little ass. You see, these legs were made for running, but that also means they should pretty good for thrusting."

You gulp and start thinking if there's anything you can do to get out of your situation. Sadly, nothing comes to mind and you simply brace for what Sia has planned for you. You feel something wet and hot poking at your exposed ass. It doesn't take a genius to know what this is. Then, with a push, your ass swallows a few good inches of the hard shaft.

Sia snickers behind you "Heh, a tight one aren't you? No worries, I'll have you nice and loose in no time."

Sia starts pressing her body closer to yours, letting her long cock slide deeper inside of your ass. Your own dick twitches from her member pressing against your prostate and it quickly gets hard under your suit. You flinch and grit your teeth as Sia's dick travels further up your rectum, stretching your anus wide open to match her 3-inch wide dong. You feel every fiber of her member traveling deeper and rubbing against your insides, and you've only reached half of her length.

You start noticing her cock bulge your stomach, as it keeps going deeper down the rabbit hole. After a painful insertion, Sia's body finally touches yours and her balls rest against your ass. She's slid her entire 12-inch schlong inside of you and you feel its every pulse and slightest movement.

"Now that you're ready, let's see how fast we can go..." Your face expresses a worried look as Sia says this, but the darkness hides your fear from anyone watching.

You feel an equally uncomfortable feeling, as Sia starts sliding her dick out of your ass, just as slowly as inserting it in. She slides the entire 12 inches, except for the head, out, and goes back to push it back in. Your breathing picks up, as you deal with the pressure and feeling of being fucked. Her speed gradually increases with every insertion, slowly getting to a reasonable thrusting speed. You grunt with each powerful thrust that hits you, clenching your fists from the feeling.

After a while of having your ass pounded, you get more used to it and can relax just a bit more. You start enjoying the feeling more and more and start moaning under your breath from her dick intruding on your insides. You place both hands flat against the wall and arch your back as best as you can. You doubt that Sia can see your efforts, but you get slightly more turned on by this domination. Then, Sia starts slowly increasing her speed beyond the norm of sex. The slaps of her hips against your bare ass echo around the room and increase in frequency. She holds on to your hips and gets in a more comfortable position, to really start giving you all she's got. You lean against the wall and prepare.

Sia starts speeding up, sliding in and out of you like a jackhammer. Your moans start sounding like they are being cut off by a bumpy road. Sia keeps getting faster and faster, going beyond anything you've ever seen. Your ass goes numb, as it gets pummeled to bits by Sia's shaft. Pleasant vibrations travel throughout your whole body, making you shudder, the wall being your only support at this point. From the sidelines, Sia's thrusts begin to look like a blur, as she puts all of her strength into fucking your tight hole. Your moans turn into one long moan of pleasure, sounding like you're talking into a fan. This **** anal pillaging makes you cum in no time and spray your sperm all over the inside of the jumpsuit. Sia starts grunting and moaning as well. Fucking at this speed makes her orgasm come rather quickly.

You feel Sia's grip tighten around your body and her breathing pick up, and then, she cums. A louder moan can be heard from her, and you feel her seed splash deep into you. All the friction has already made your insides raw and hot, but Sia's jizz still is noticeable in your rectum. Sia's momentum is too large to stop immediately, so she still manages to get a few dozen more thrusts in before bringing herself to a stop, deep inside your anus. You moan as her spunk fills your insides. Load after load of her thick cum splashes inside you and your ass gets filled with sperm. You both breathe heavily as if just running a marathon. You two take a minute to get your strength back.

After resting for a few seconds, the lights in the room come shining back on. You cringe away from them, but once your eyes adjust, you take a look behind you. You see Sia, with her face covered in sweat, but a smile on her face. She's still taking a breather, but after a few seconds, she looks good to go. She quickly pulls her cock out of your ass, taking you by surprise. Your sphincter quivers from the feeling and you take a seat on the floor, completely tired out.

Sia looks down to you and says "Hey, that was a great workout for both of us. Hope I'll get to try something like that out on the field one day. And hey, at least you were a good sport."

You exchange smiles and then, Alan speaks to you through the speaker. "Good job guys! While you were having your fun, we decided to measure how fast you were going at our little test dummy here. After our calculations, at your fastest, you came out with a whopping 1600 tpm (thrusts per minute). Impressive stuff! Well, anyway, let's get you back to your rooms, shall we?"

Sia gives you her hand and hoists you up from the floor. You both say your goodbyes and go to your rooms.

(Fun fact, the average male thrusting speed is 100-200 tpm)

You got the "Quickie" ending with Sia.