I can feel the weight of Kitty's body above mine, supported by the gently creaking swing looped around her perky ass. The slight tremors running through her almost-naked body, the slick of sweat and baby oil upon her skin, the muffled moans struggling to escape through a ball gag propping her mouth open. Her breathing is rapid, shallow, and not helped by her predicament. She is constrained, a shuddering pendulum, legs strapped up securely next to her masked head in a lewd pose that puts her pussy and ass on display, as well as framing her tits with her upper arms. She is blindfolded, gagged, and bound. Just as she had asked - like a present.
The tremors across her body grow, and Kitty shifts her weight, causing her asshole to clench around the head of my cock. I moan and ease it a little deeper, provoking a coo from above.
It had taken almost an hour to get here, both of us now waiting to spring our surprise. Kitty had arrived a little early and said a passing hello to Cat as they left. The moment the door had shut, she had swung around with an evil grin. "Cat has no idea what they're in for."
After an eager rimming, I had worked her up to a butt plug and began the process of transforming her into a fuck-toy for the evening. After tying her into the swing so she couldn't move a muscle, I kissed her deeply before sliding on the mask.
"Don't be too cruel," she whispered.
"I don't know what you're talking about."
I had about thirty minutes, which was plenty of time to work Kitty's body up into a frenzy. Light slaps on her bare ass turned to solid spanks, the sound of her squeals through the ball-gag making my cock swell. After her ass turned a rosy pink, I turned my attention to her nipples, harvesting the drool dripping from her gag to slather them, pinch them, and roll them between my fingertips. She moaned as I alternated between gentle teasing and rough tugging, squirming her exposed pussy around in an attempt to rub it against something.
I couldn't help but stroke my cock lightly as I rubbed every inch of her exposed skin in baby oil. The sheen of her curves made her obscene display somehow even more delicious. Our surprise was almost ready.
I placed Cat's favourite strap-on next to the door, alongside a bottle of lube after generously coating my condom-covered cock. I savoured the sounds that slowly pulling out Kitty's buttplug prompted, and drank in the filthy sight of her relaxed asshole winking above her dripping pussy. Both holes would be getting a workout tonight.
Sliding myself under her and pressing the head of my cock against her ass, I felt it gape and surrender slowly. With soft encouragement and gentle swinging, soon it was buried right to the base.
And then it was only to wait, our perverse exhibition facing the entrance way, the gentle sway of the swing rocking Kitty torturously on my hard cock.
I hear the jangle of keys and the sound of the door swinging open, and Cat's voice.
"Hey guys, I'm home! Did you miss-" They stop mid sentence as their eyes fall upon their present. "Oh my fucking god..." They meet my eyes and a mischievous grin spreads across their face as they spot the strap-on.
"Happy birthday, baby," I say with a smile.
"Holy shit, happy birthday to me," they gasp, ripping off their skirt to expose their perfect breasts and hourglass figure. They pick up the strap-on and secure the harness. It's big, bigger than me by an inch and far girthier. I think about how it's going to look stretching out Kitty's poor little asshole. But for now, Cat grabs it in their hand and slaps it on the poor girl's exposed pussy, making her flinch and moan before trying to move her hips closer towards it.
Cat is not so accommodating, instead taking the opportunity to explore Kitty's bound form. They kneel down to take in the sight of my cock buried between her cheeks, and I feel their warm breath graze my balls as they lick all the way up Kitty's lips. The girl squirms as Cat's mouth closes on her clit, the movement massaging my cock.
"How long have you had her like this?" Cat asks.
"About half an hour."
They chuckle. "Must be pretty ready then, huh?" They think for a moment. "I'm not yet."
They march around, swinging their hips back and forth before hovering above my face. They too reach over to grab some spit off of Kitty's gaping mouth, wiping it over the silicon shaft. They grasp her neck and squeeze a little, causing her ass to once again clench. I grunt and Cat smiles down at me.
I don't have long to study how the strap-on threads either side of their pussy lips before they lower themselves down on my waiting mouth, grinding their wet pussy and clit against my lapping tongue. I feel the rocking motion as they continue to stroke the strap-on, and hear them adding their own spit to it. The sloppy sounds of their hands lubricating the shaft as I worship their pussy almost makes me lose control.
It's only made harder a moment later, when I feel the swing begin to rock, pushed by my lover. It causes my shaft to rock in and out of Kitty's ass, and she lets loose a long continuous moan that grows slowly in pitch.