Get out of there!

Nope, you want none of this. You gotta get out of this situation now! If you run now, you might surprise Sia and get a respectable distance away. You shift your weight to the front of your body, quickly prep your mind and prepare to gun it.

However, your daring escape is quickly over. As you take your very first step, you instantly trip on Sia's foot. You were so committed to the run, that you fall face first on the floor. You quickly understand how fucked you truly are. Well, you've already gone so far, so you quickly get on your hands and knees, to keep running, but Sia stops you right there. She quickly jumps on top of you, holding your body firmly in the position it's in. You can't move, as her hands and legs restrict yours.

She starts speaking in a disappointed tone. "Now, I don't use this term much, but that was a foolish move. Since you want to run like a dog, I'm going to go ahead and take you like one..."

Sia's hands move down to your ass cheeks and spread them apart, undoing the zipper covering your butt and cock. You feel her hard and throbbing dick press against your delicate anus. Her tip is absolutely drenched in precum, making it slide in without a hitch. On your side of the story, it sure doesn't seem that way. Her thick girth spreads your tiny asshole open to the width of your fist, and seeing how fast it's sliding inside, your rectum gets molded too. You grit your teeth and try to brace the pain as much as you can, even though you know that you deserve it. Sia's shaft goes deeper and deeper, pressing hard against the inner walls of your ass and stretching you out even further. When just half of her length gets inserted into you, you already can't take any more, but there she goes even deeper, her precum spewing tip leading the charge deeper in your anus. After Sia finally inserts all 12 inches of her schlong inside of you, you both let out a sigh of relief.

Sia slides her hands all the way up to your shoulders and gets a good grip on you and says "Get ready mutt, I'm about to ruin that little butt of yours. Let's see how fast you'll run with a gaping asshole."

With a forceful pull, Sia quickly slides most of her length out of your aching anus, making you moan out loud from the sensation. And before you know it, she thrusts fully back into your ass, forming a loud slapping sound as her hips connect with your cheeks. It echoes through the otherwise silent and pitch black room. She draws another loud moan from you and starts gradually building up a rhythm of thrusting into your ass. You grunt as you feel Sia's thick meat press against your prostate and feel your erection rise up. Soon enough, she's pounding in and out of your quivering asshole, giving you her best.

After slowly building up her fucking speed, Sia starts thrusting inside of you harder and harder. You both moan loudly every time her giant cock presses against the deepest parts of your ass. As she keeps fucking you, her hands move down from your shoulders to your back. You instantly arch your back as much as you can, making sure to give her as much pleasure as you can. You get into being fucked like an animal, so you start bucking your hips back into her dick at the same time as she enters you.

This takes her slightly by surprise and she says "Oh, you like that don't you? What, don't want to run anymore? Well good, because this ass is the tightest thing I've ever felt, and I wouldn't give up on it that easy."

Time passes, and your asshole forms perfectly around Sia's thick shaft as she fucks you relentlessly. You feel her junk throbbing and getting hotter inside of you. She must be close to cumming! The excessive stimulation of your prostate makes you pretty close to orgasm as well, and you feel like you're going to burst any second now. You decide to hold it off as best as you can so that you and Sia both cum at the same time. You listen to her moans getting louder and her speed increasing evermore when finally, she orgasms. Sia let's out a long and passionate moan as she delves balls deep into your quivering anus. You can feel every movement of her cock inside of you, as it twitches right before releasing a huge load of sperm inside of you. You can feel the hot and thick liquid painting your insides white as it shoots even deeper than where Sia's managed to get to. Her giant loads keep spewing out of her dick, filling your belly up with her cum. This drives you over the edge as well, and you start squirting jizz from your dick, forming a puddle of jizz underneath you.

After your orgasm subsides, you still feel some final drips of cum exit Sia's cock. She lets out a big sigh of pleasure and pulls her softened shaft out of your rectum, and disappears back into the darkness. You slump down on the floor, ass in the air, after being ravaged by her giant dick. You can feel an empty feeling inside of you, like a part of your body had been taken from you. Your ass gapes wide open as it tries to clinch on to something that's not there anymore. Meanwhile, Sia's cum starts leaking out of your anus like an open drain, emptying your stomach of the sperm what was pumped into it. Then, the lights in the room come flashing back on, blinding you for a few seconds as your eyes adjust. After taking a rest, you stand back up, feeling the aching in your lower half and take a look around, The beautiful and elegant Sia is sitting on the couch with her legs crossed and one arm propped on the backrest. She beckons you to come and sit with her. You comply and take a seat next to her. You rest your head on her shoulder as she puts her arm around you and you both take a little rest from the whole ordeal.

The speakers turn on and Alan can be heard on the other side. "Well, what can I say, great test everyone! I was sort of expecting you to make a better attempt to escape, but I guess Sia was a bit too intimidating for you, which is kinda what we're aiming for. Good to know she's just as forceful and fear-inducing as she needs to be. Anyway, that concludes this test. Be sure to return to your rooms when ready. See you in the next one!"

The speakers die down and all you hear are the breaths of you and Sia. You rest for another minute, before finally getting back on your feet and each heading to your respectful rooms.

You got the "Klutz" ending with Sia.