Fiona takes you

"Put your hands behind your back." Fiona orders you. She has an almost distant look in her eye, she seemed to be in some sort of trance.

You obey her. El risks interrupting the moment to squirt another spurt of lube onto your ass. Fiona doesn't even notice her. Fiona bends both your arms behind your back at a 90 degree angle. Kneeling up over you she grabs your forearms and presses them hard against your back, pinning you to the ground with her strength and bodyweight. You grunt from a bit of pain in the shoulders, arms, and chest. She moves over and is kneeling between your legs, kicking out with her knees she forces your legs wider. You are on your stomach pinned to the ground, you feel her monster cock begin to slide up and down your ass crack. Like a too big sausage along a small hot dog bun.

El whispers. "Don't hurt her Fiona, please." The light mood had suddenly turned just a bit darker.

You were about to put Elsie's mind to rest. You wanted to let Fiona have her way with you. You were strong for a girl and could rebuff her if anything went too far. It is then you realize...no you couldn't. You struggle a bit just to test and Fiona holds you down powerfully. In this position you were helpless! Fiona could have her way with you, whether you wanted it or not.

You feel her hand grab your hair and pull it back roughly. Your head cranes back and you let out a little mewling yelp. She leans forward and hisses in your ear. "If you want out of this, you have to tell me now Jesse."

You think for a second. You could just see her out of the corner of your eye. This was actually scary, Fiona was a fearsome creature when she was at her full splendor. Her cruel but beautiful face, her tall lean powerful body, her magnificent pouting tits, her record breaking cock. She was a vision of pure feminine power, the ultimate dominatrix. You could feel the power of her personality and dominance radiating off of her. What would she be like in a proper bdsm dungeon in heels and leather!? You were in awe of the thought of it.

You whisper. "Fuck me Mistress. Please fuck meeeEEEEE!"

She pushes her behemoth into your recently fucked asshole pussy. Thank god El had warmed you up first! Jesus Christ she was BIG! While not as big around in the middle as your mom, she was thick end to end. And she was harder too. You let out a loud grumbling groan. She pushed DEEP into you, deeper than you had ever felt, deeper than you thought possible.

You want to bury your face in the pillow but she held your head back. Your pitiful cries going out into the open air. She began fucking you in long controlled thrusts.

You hear her let out an almost sinister laugh. "Little sister...ohhh my...you are gifted my little slut."

You just grunt and whimper in response. You were overwhelmed, you just couldn't form the words to respond. You did feel good at her praise however. Her penetration had your ass on fire, a sensuous carnal fire. You fucking like it!

She begin to slowly and methodically pick up the pace, the whole while keeping you firmly in her control. Letting go of your hair your face falls forward into the pillow, you let out scream of animalistic zeal into it. Fiona slaps your ass hard. Smack!

El gasps. "Oh no!"

She spanks you again, even harder. Smack!

You cry out. "Oooo! It's okay! Oh god! It's okay El!"

Fiona laughs a wicked joyful laugh. "Ohhhh my sweet little Jesse...the fun we could have!" Fiona was obviously starting to wonder if she had finally found that playmate she had always longed for.

Smack! She spanks you again. You flinch, involuntarily tightening around her. She moans. "Mmmmm. I don't usually like this...but you feel goooood Jesse. You feel good my little slut." By 'this' you were pretty sure she was talking about anal. Once more you were proud to be making her feel so good. Unlike you and El from earlier, premature ejaculation was not going to be a problem for your big sister.

As she begins really picking up the pace she grabs your arms with her other hand now as well, gripping them tight so she can pull herself toward you for a better forward thrust. She is fucking you hard and fast now. The sounds of her slapping hard against your butt a steady drum beat inside your silly blanket tent. Her massive swinging balls were slapping and knocking against your little ones.

Under you your little lady cock is rubbing rhythmically up and down against your sheer silky nightie in time with Fiona. You were hard as ever once more and heading for lift off! With what she is doing to your back door and prostate you are over the moon, leaking precum everywhere. Your belly is wet with it.

You are groaning heavy now. You start gasping. "Oh god...you're gonna make me cum again...oh god! Oh Mistress...can I cum...can I cum please!?"

She fucks you even harder! Your entire nether region is absolutely aglow. She is merciful. "Cum for me Jesse, cum for your Mistress!"

You try to buck or squirm but she holds you firm. You just let out a low bellow like a head of fervent livestock, most unbecoming of a girl like you. "UNGHHHHH!" You feel it get real warm and gooey under you as you explode. "UNGHHHHH!" As you cum and cum and cum your sphincter tightens spasmically.

Fiona is going full tilt and breathing heavy. "Good girl! Good girl! Oh god, that felt good on my cock!" Her breathing is really picking up now. She lets go of your arms...sweet relief!!! Your limbs flop to your side and the pressure is taken off of your shoulders at last. Somehow the release of pain magnifies your pleasure tenfold. You moan yet again. She grabs your hips and blasts away at you, building to climax.

Ramming forward into you harder and deeper than ever she suddenly freezes, her muscles locked. She holds you against her as you feel her massive cock throb within you, feeling each pulsing throb perfectly in your tunnel, depositing what seemed like an endless supply of jizz. Gasping for breath she finally makes a noise. "GAHHHHHRRRRRR!!! OHHHHHHH FUCK YES!" She finishes with a few softer stabs into you. You feel as her throbbing member finally finishes. She lets out a breath. "Whhooooooo...."

She pulls out slowly...gently. She tenderly kisses the top of your buttocks. "Oh my god...thank you Jesse. You were incredible."

El whispers. "Are you okay Jesse?"

You roll over and smile at her. "Never better...but I think I made a mess."

You all look at the huge wet stain on your nightie and start to giggle. Yes, even Fiona. All three of you begin to giggle and laugh and playfully kiss and embrace. The Bailey sisters were having the best sleepover of all time!