Hot Summer Job/Reach behind you and grab onto her
You grab at her body blindly and wildly, pawing at her skin, groping her ass, and running your hands along the sides of her torso. Larissa wiggles and giggles under your touch. Despite her shyness and hesitation she clearly loves the attention and enjoys her nakedness, possibly as much as her sister. You're not looking to get naked yourself, but this is an opportunity you don't want to pass up. Your pants can wait.
"You're grabbing my butt!" giggles the naked tween.
"Really? That's your butt?" You feign ignorance, squeezing and spreading her cheeks more deliberately. "It's too small to be a butt!"
Larissa laughs and postures up a bit higher, grabbing onto your shoulders for support. You move your hands even higher, pressing high and low on her back and forcing her body against yours. As her body conforms to yours you can tell where her crotch is against your back. It's probably all in your head but part of you thinks that the harder you squeeze her into you the more of her pussy mound you can feel.
CLICK
That's weird. Something hit your wri-
CLICK-CLICK-CLACK
It's cold. Metal. Metal is around your wrists. A piece of you panics. You could be in deep shit right now. Thankfully when you turn to the side it's Kylie standing there and not a SWAT team.
"Geez, you scared me," you blurt out. "What are you doing?"
"Don't worry about it," she replies, just as naked as when she left.
You swallow. "I... I'm not. But why did you handcuff me?"
"She handcuffed you?!?" Larissa repeats in surprise. She wriggles down your back and ducks out from behind your arms. You turn around to face the two of them, Larissa stepping with you trying to examine your shackled wrists.
"Why not?" She shrugs. "I found it in mom's room. She has lots of cool things hidden away that we aren-"
You have to stare at Kylie's body. You can't help it. Even if you should be thinking or talking your way out of your newly acquired steel bracelets, your brain is only wired one way. And she is so worth staring at. Her tits are perfectly round little hemispheres placed high on her chest with a tight little excited nipple in the dead center of each perky breast. That leaves a long and well toned stretch of skin leading down her stomach and pelvis between her tits and pussy, an alluring expanse of pale flawless skin interrupted only by her belly button and that tiny bit of red fluff above her sex. But it's her fingers that you find strangely distracting. It's her blue nails. They draw your eye, especially when she has her hands on her hips like that. Her digits are quite dainty. More like Bree's. And yet you can easily imagine them wrapping their way around your dick and pum-
"...am I right?"
"Huh?" you shake your head, dazed. "Oh, uh, yeah... sure..."
The look on Kylie's face is that of pure amazement. You clearly didn't answer her correctly. Or at least the way she expected you to. It would be great if you knew the question.
"Well Rissa, did you want to help Ry out?"
"...what?" you reply, a weak follow up to a mumbled answer of a question you didn't hear.
Larissa jerks her body about in a very hyper and animated fashion. "Okay!"
You glance between the two stripped, excited sisters before you realize what they're looking at; the boner in your underwear. You've made quite the circus tent with your stretchy boxer briefs, so it's no wonder that it has caught their attention. But when Larissa steps forward and slips a set of her delicate fingers into one side of your waistband you finally clue in.
"Woah! Hold up!" You take a step back but bump into the coffee table. Larissa pauses at your protest and looks back at her sister.
"He's handcuffed. He can't stop you," notes Kylie. "Just pull on the front."
Larissa turns back to you, alternating naughty and evil looks being directed at your underwear.
"Wait, I, uh... changed my mind."
"Nope! Too late!"
You grip the back of your waistband and hold as tight as you can, but Larissa reams down on the front with plenty of stretch in the material to pull it down past your dick. Your raging erection springs up in front of Larissa's face. She literally ducks down in front of you when it pops free, taken by surprise. Her girlish strength can't pull your underwear out of your grip, but having pulled it below your dick is more than enough. Hands cuffed behind your back, you'll never get your briefs any higher than your balls while you're this hard.
Letting go, Larissa teeters back and sits on the carpet staring up at the underside of your cock.
"It's so long..." she says, almost dreamily.
Kylie scoffs. "He's not that big. I've seen way bigger."
"Bigger..." parrots Larissa, leering at your man-meat incredulously. She might have a more favorable angle than her sister, but you're certain you're above average. Not that Kylie should know what average is, let alone Larissa.