She jumps on you (Leg lock oral)

One second, you're looking **** in the face, and in the next, Sia is already leaping on you. She quickly takes you to the ground and forces you on your back. She quickly positions herself on top of you and takes a seat on her knees, letting her butt lay on your chest and her thighs go on either side of your head. She presses her legs together so that your head is locked in between her lean thighs, unable to move. Her hard cock hovers from her crotch and over your head. It's hard to see in the darkness and from her member obstructing your vision, but you can make out a victorious expression on her face, looking down on you.

You're still a bit startled from the whole situation, and sweat starts building on your forehead.

Sia is first to speak up. "Aww, don't look so scared, I'm just holding you tight so that you don't run off. I mean, you wouldn't get far, but that's still a hassle on my part. Now, since you already had a little sample of me back there, I'm sure you'd like the whole meal. Since I don't want you slobbering over my cock and making a mess, how about you just be a good boy and let me feed you?"

Her voice is quiet, fitting in well with the silence in the room, but still commanding enough to make you not want to let her down. Considering your position, you don't really have a lot of say in the matter, but you still don't feel like completely giving in just yet. You don't respond to Sia's proposition.

"Not cooperating are we? Well, I have other methods to get that little mouth of yours open..." As she says this, you start feeling the pressure from her soft thighs on your head get bigger.

She presses them together harder and harder, crushing your head in between them. If you don't do anything, she could easily pop your head like a balloon.

"OK, OK I'LL DO WHATE-" You yell out, before being interrupted by something blocking your mouth.

Sia quickly shoved a few inches of her thick shaft between your lips, which catches you off guard.

"Shh... no reason to scream. Just enjoy this." She says while patting your head with one of her hands.

Your mouth is immediately filled by the taste of Sia's precum. Your tongue starts sliding around her tip, exploring her tender cock meat and slurping up any precum that leaks out of her dick hole.

"Now that we're on the same page, relax your tongue and just let me give you this..." Sia says while slowly guiding her hands up to the top of your head and grabbing onto your hair.

You let your tongue stick out the bottom of your mouth and give Sia full reign over your face. She angles herself so that her 12-inch monster lines up with your mouth and she starts pulling your head onto her cock, simultaneously sliding herself closer to get the rest of her length down your throat. The feeling of her dick sliding down your throat hole is rough, as it has to curve almost 180 degrees to be shoved all the way in. You start gagging and ****, letting your spit fly from out of your nose as her cock slides deeper and deeper down your mouth. Soon enough, she has your face up against her stomach and her dick all the way down your gullet.

You start struggling, shaking your head and your legs from the lack of air, as Sia holds you steady for a minute straight. Then, she quickly throws your head back, letting go of your hair and sliding some of her cock out of your throat and giving you a chance to inhale deeply. She's slid her crotch so close to your face than even with your head not being held down by her, half of her shaft is still lodged in your throat. You have to breathe around her dick, which makes it a bit difficult, but you manage.

Not giving you much time, Sia quickly grabs your head again and pulls you back down on her shaft, sending it down your throat once more. It doesn't go down easy, as it still has to contort to slide down your hole. It doesn't feel too good on your end, but for Sia, it's added pleasure. She then pushes you off of her dick but quickly shoves it back in again. She starts using your head as a fuck toy, ravaging your throat with great strength. You **** around her cock as it slides up and down your throat, but that just makes her enjoy it even more. Your eyes start watering, but Sia shows no signs of stopping or even slowing down.

You can't tell how much time has passed, but all you've been doing is being Sia's cocksleeve, even starting to move your head up and down her cock voluntarily. You taste her distinct precum all over your mouth and some of it has leaked out of your mouth and around your face, along with your saliva. You start enjoying the feeling of her thick member rubbing against your throat pipe, even getting your cock hard. After a full hour has passed, Sia starts showing signs of her orgasm. She speeds up her fucking, smacks against your face even harder and starts moaning under her breath. You start moaning around her dick as well, giving her the best treatment that you can.

Sia let's out an audible grunt and presses her dick as deep down your throat as she can. You feel her sperm travel throughout her cock and make it's way to its tip, where it erupts into your stomach. Her load is huge, and you already feel filled up by just her first cum dump, bet there's more to come. Sia sprays multiple giant loads of her spunk straight down your throat and into your belly. After a full minute of nothing but swallowing her cum, she finally lets go of your head and reclines back, so that her dick pops out of your mouth. You swallow the mouthful of sperm that you still have and enjoy it's salty and bitter taste and it's thick and creamy texture. Sia gets off of you, letting you stand back up on your own two feet.

You stand in darkness for a second before the lights in the room come blasting back on. You squint your eyes at the sudden brightness, but quickly get accustomed to it.

Sia stands a few feet away from you and is looking happily at you, leaning against the wall. "That's one hell of a throat you got there, kid, don't lose it," Sia says, jokingly.

You chuckle and say "Heh, thanks!"

Then, the speaker system turns on and you are greeted by Alan's voice. "Well then, great work everyone! We were hoping that you'd last longer without being found, but that just proves that Sia is the best at what she does. Got some great notes! Anyway, you can both go back to your rooms and rest a bit before the next test. See ya then!"

You part ways with Sia and head back to your room.

You got the "Tight fit" ending with Sia.